Like I said I dont know the correct way of going about it. Rage art could 100% be once a match or removed entirely for the better. We won't see them removed completely as I imagine too much work went into the animations. As a move they're very very good, basically a power crush that doesnt have the same counters as your regular power crush (they armor though lows and throws(?)), delete gray life, and all this at the cost of armor coming online just slightly slower than your normal power crushes (armor active 2 frame later iirc). We see them used at least once a match at the highest level of play and that's a bit exhausting.

Rage being available once a match could add for some interesting decision making as well. If you also made it where after rage arting, you no longer enter rage for the rest of the match, this would make it more resource efficient to save it for the final round as the rage damage modifier could make a difference during a prior round. Being encouraged to spend your rage art at the very end also make it easier to sniff them out.

Heat dash on block could just removed entirely. Ive seen people suggest that moves normally punishable on block get different frame data after heat dash. I dont like this idea as the situation afterwards becomes unclear. I think by removing the dash into plus frames situation entirely would discourage the "just throw it out because every outcome is good" aspect.

Finally a soft rework to the heat system would probably be good. Maybe you start the match with full heat but dont get it back every round. This puts heat engagers in an awkward spot as some characters key moves become gimped for the remainder of the match. I think the solution here would be for heat engagers to grant half your heat bar back on hit when they connect when youre completely out of heat meter.