I would say that the old system is perfectly fine.
Maybe needs some balancing here and there, but the overall gameplay works fine.
What would be a big improvement would be to have WAY more victory/defeat scenes as well as more variations/reactions from the girls.
For example, Shion.
You get one reaction if you play with her tits as well as a victory screen if that's the move that beats her, and/or even a slight variation on the defeat screen if the last move you did before she won, was involving her tits.
You similarly, you could have her react if you do play with her tits/nips to give the player some extra info on if the move was extra effective or not without making it seem too techie.
Doing this will allow you to make the combat more interesting, because now there are a whole lot of scenes that we can unlock, motivating us to keep trying new things, especially if the scene changes after a while.
Like win three times using one move will go from "victory fingering 1" to "victory fingering 2".
This is how you can make the combat more interesting, the reward.
The old system is perfectly fine in my opinion.
My suggestion would not work at all with the new system since it would just end up making the player frustrated as your "piledriver anal" which would unlock a scene you have never seen before, fell short by 2 and now you have to use a move with a victory scene you have seen 15 times or lose instead.
You could even have some special moves that require certain situations to activate.
Example with Shion again (can you guess which girls my favorite?).
She has you in the cowgirl position, you manage to reverse it, you can now chose to go full on mating press as a move/position.
Also dick growth spell during sex could be used as a strategy to potentially inflict a one turn stun.
Also adding more variants to some of our moves such as fingering having the option of which hole it goes in.
Making it the randomness that is card games would make it way more difficult for the player to properly experience the scene cause maybe you want to go with slow sensual lovemaking and end up with a hand full of only the driest anal nelsons.
Also, I would put more focus on completing at least one of the girls overall story than adding more girls.
I would personally prefer a small number of highly fleshed out girls than one hundred girls with about 3 five line scenes each.
Quality over quantity.
P.S. 25$ A MONTH? For that "quality"?
Those buggers are karking scamming you!
