After playing some games, I really like gameplan cards for now. It does make the momentum race more important and a +1 over the opponent is usually more valuable. The cards did get rid of the one thing I found too swingy in the games, being the initiative roll. I've won and lost games due to someon losing the initative with +4 momentum and this feels like garbage for both players. The cards still have luck in it due to the luck of the draw, but even with a very low initiative value draw you can at least plan for it. I am ok withe random cards since you have to then adapt your play to your cards, but I think a draft could have worked, too.
Also, always playing a high card when up on momentum and always playing a low one when down does make you exploitable, especially in longer games.
The only thing, but that is an OPD thing, everything being off the clock isn't good, in my opinion. The first player to put down a card should be allowed to start his opponent's clock.