I wasn't very proper in describing my system (was in a hurry and doing 3 things at the same time as usually because my day is always much too short...). I edited the original posting and marked it blue, but that doesn't really change the subject, or? Sorry anyways!!!
With the posted hand I felt I had a problem and decided to bid 3
♣= 9-11 with 4 trumps, which comes closer to the hand than anything else imo. My immediate feeling (

) was to jump directly to 4
♥. Now, after 3
♣, my LHO found a 3
♠ bid and they ended in 4
♠-1 while we had 4
♥. LHO said afterwards that he wouldn't have been bidding after an immediate 4
♥ 
So it is always also that tactical move which lets grow grey hairs...
My partner voted for 2
♥ with my hand = 6-9. I still don't like that (sorry p
♥!).
The interesting question for sequences like the aboves is perhaps: is slam an option? We open 1
♣ with 18+, so p is limited to 17. My hand is nice with 2 keycards, therefore I decided that slam MIGHT be on, it is too strong for 4
♥. If I would be sure that slam never is on (never say never...) I jump to 4M? Is my thinking correct?
Thx again
Those are my principles. If you don't like them I have others. (Groucho Marx)