Key problem was whether doubles are or SHOULD BE penalty or takeout in different situations; since we don't have any agreements here, we both bid what we thought it "should be" and weren't on the same page.
So...we're looking for suggestions on a set of agreements to handle NT interference...ideally, these agreements will:
2. Be appropriate for good intermediate/early advanced players.
3. Address all key bidding needs after NT interference: bidding to right game with game-forcing strength (including assessing stoppers), provide opportunity to penalize over-aggressive opponents, transfer/escape to long suit when responder has weak hand. Bonus points if there are ways to invite NT opener to game, but I'm not optimistic this can be added in.
I suspect many will recommend Lebensohl, which is fine...but I don't believe Lebensohl includes agreements on how to use doubles. If that's indeed true (correct me if I'm wrong here), then Lebensohl is an incomplete answer.