Sounds like you would have more fun if you split the party.
As in: split the gaming group.
Couch potatos don't make good adventurers. Nor do people who would be considered tight pokerplayers. It's just no fun.
When having a tactical lan-party, or playing some cardgame like magic: Lotta fun. Dnd, not so much.
If these are all good friend and dnd is a way of keeping the group together: play some other game every third week with the whole group and play dnd with the adventureminded during the other 2.
It's all a bit drastic, but it is something to consider.