Hi John,
Don't beat yourself up... It is clear that you were playing in an imp tournment. Sound bridge can easily land you at 0 imps or even with a minus imp score (in an event with few boards). You can even be minus even though you make no obvious mistakes. The reason why is that a huge swings happen at other tables, and these swings effect your score... let me give you four examples.
You hold....
S-QJxxx
H-T94
D-JT9x
C-7
Bidding goes...
(1C)-P-(1H)-P
(2C)-P-(3D)-P
(4C)-P-(4N)-P
(5C)-P-(6H)-all pass
Only a trump lead can hold this to 12 tricks. You hold them them to 12 tricks and get MINUS 9 imps. At least you held them to 12..... :-(
852
9865
AQ85
A7
AKT976
AQJ
4
965
South deals, do you get to 4S (1C, 1C ruff, 1D, 2H and 5S at least?). Of course you do, easy bridge, and this is what my opponents did too. But as the opponent of this pair, I defend perfectly and hold them to exactly their sure 10 tricks. Good bridge by both, right? Sure. But as EW I lose 4 imps, and NS gains 4 imps. So while the entire field should be in 4S, many did not reach it, and some overreached to 6S.
If you get four of these 4 imp loses (asI did) and throw in that one of slam against you and you can't win an event of 8 or 12 or 16 boards.... I was actually lucky to squeeze out a modest +13 imps for the event.
Now what was happening to the event winner? Were they picking up 3 and 4 imps for normal games? No that isn't enough either... Let's take a look at just two of their winning hands....
EW/vul
KJ3
AJ83
75
J763
A5 QT8762
KT9653 4
JT K64
KQ4 982
94
Q7
AQ9832
AT3
E S W N
2S 3D 3H X all pass
At your table, you might bid 3NT as NS, and if you guess right, you might make it, for a loss of 1.6 imps while the winners are racking up nearly a positive 12 imps. And if you stop in a part-score as NS, you lose 5 imps, and if you guess wrong and go down in 3NT? You lose 9 imps. So, NO MATTER what you do as NS on this hand at your table, you are going negative if the opponent's don't hand you a gift. This is because of gifts at the other tables (4Sx, 3Hx, 2Hx).
Does that mean the "winners" used a better system than you? Of course not. Does that mean you played poorly? No. You just were not in position to win, and at Pair-IMPs this happens a fairly large amount of the time... especially in 8 board events. If your opponents can bid 5 laydown games out of 8, you simply will not be able to win, because that will be five 2 to 4 imp loses for you. So if you sitting the way that the five games went, and you bid all five for plus imp scores...does your winning or losing depends upon how you handle the other three? Nope, you are already screwed again. Why? The HUGE scores are for the players sitting the other way whose opponents miss three or more of these games. On those hand, they pick up 6 to 10 imps each. ARGHHH.. you can only win if a) you don't have the five game hands, and

your opponents don't bid the games. Pair Imps requires good players everywhere or it is a crapshoot.
Now at matchpoint, np. On the 3Hx hand, bidding and making 3NT would be 66.7% score (losing to 4Sx, 3Hx, 2Hx, 3NTx, and 3NT+1). But still, you control your destiny.
The second hand from the event winners
AQJT642
A9
4
T95
K75 83
3 QJ764
J52 K873
J87643 A2
9
KT852
AQT96
KQ
S N
1H 4S
4N 5H
6H All pass
Yes, the winners, were the EW pair again (the same guys who doubled off 3H's). Again, did they have an outstanding system? Nope, They just sat there and racked in 11.2 imps. And if you held the EW cards? Your NS opponents bid to a tame 4S and you lost 3.9 imps.
Did your opponents out play you by 15 imps on this hand? Was their system superior? Of course not. Welcome to wildness of pair imps game in a weak field.
IMPS is very well suited for TEAM game, where you can rely on your partners to bid the cold games, and slams. Now it is your skill (as a four man team) against their's. In a strong field, IMPs is also a great pair game. You can rely on the field to do the right thing, so you get richly rewarded for good decisions, and get normal results for normal bridge. But in BBO pair events, every laydown game your opponents reach, figure you lose imps. Every cold game you reach, figure you win imps, and to actually win, you need to catch a few lucky breaks like the pair above did. Two of those, and normal bridge elsewhere at least you have a shot at winning. No gifts in a BBO IMP game with 30 tables or so? Then very little chance of first no matter how you play because SOMEBODY is getting the gifts.
Ben