When I play half guard I like to play the underhook game or a half butterfly. If my opponent is actively trying to flatten me out then I feel like I am in control of his weight allowing sweeps and such. This is extremely true with wrestlers who like to pin your upper body because it leaves the hips light. My problem is that more experienced guys keep thier weight back a lot more and don't allow me to get under thier base. If I do get a good underhook and try to get under my partner, I'm usually rewarded with a brabo attempt or my head pushed down on the mat, either counter serves to destroy the effectiveness of my underhook and allow him to get his weight back. Once he is sitting back he can work to pin my legs together and walk around quite easily. I've tried sitting up into him and working for an underhook, but the problem is that when I am on my elbow sitting up, I can no longer block the crossface which gets me flattened out and vulnerable. This is both no-gi and gi by the way, but at least with a gi on I can attempt to work a leg lasso and can control sleeves better when he sits back. Advice?