A lot of ranges need tweaking here to try and get to the more reasonable 5♦ (though still failing as cards lie) instead of the rather hopeless 6♦.
1- Should 3D really show 16-22?? To me, with the 2c free bid and the spade raise, I don't think it should really be that strong. Strong hands should double/bid 3S IMO. 3D should just show long diamonds IMO and min.
3d should only be 16+ if GIB wanted to play Good/Bad 2nt, which is probably too fancy for the general BBO pop.
2- 4C should have some upper limit especially if 3d is adjusted to be NF. If 3d is really supposed to be 16+ then maybe 4c should be F.
3- 4d surely should have some lower upper limit, 16-18 at this point if not less.
4- 4nt surely is too much, 5d should be plenty?
1- Should 3D really show 16-22?? To me, with the 2c free bid and the spade raise, I don't think it should really be that strong. Strong hands should double/bid 3S IMO. 3D should just show long diamonds IMO and min.
3d should only be 16+ if GIB wanted to play Good/Bad 2nt, which is probably too fancy for the general BBO pop.
2- 4C should have some upper limit especially if 3d is adjusted to be NF. If 3d is really supposed to be 16+ then maybe 4c should be F.
3- 4d surely should have some lower upper limit, 16-18 at this point if not less.
4- 4nt surely is too much, 5d should be plenty?