IDK how to answer that. I doubt 50/50 will help you so you either need to slow the spring down on extension, or on compression.
IOW, the way I understand that shock is you also have a 60/40 and a 70/30 setting. If so, I'd make it so it is on the 70/30 side and try and tune that.
By that I mean you are either going to slow the spring down in extension or compression. That's what you'll have to deal with. But damn, if you slow the spring down in extension, but it's actually less dampening in compression you still might have an issue with the tire unloading.
Can you see the corner you are painted into? One way or the other you are going to compromise spring control. You can work with tire pressure and the other stuff skrewssaid, but still, you are showing up to a gun fight with a pan of noodles.
It would be better if you can slow everything down in both directions, but at this point you are going to have to deal with what you have.
FWIW, when I bought my car it had some junk KYb shocks up front and that 50/50 shock on the rear. So I beat on it awhile, because before I bought the car and it belonged to my cousin so I drove it a bunch.
Anyway, he didn't want to buy a good shock, so that's what he bought and that was on the car when I got it.
I replaced the fronts first with Viking DA shocks. Then the rears. When I pulled the rear shocks off, the one on the right side was toast. It had beat the valving out of it. It had no dampening in either direction.
You get what you pay for.
