I have more forward lean on the front than the back for charging/carving. A bit less at the beginning of the season since the muscles need to build up, then step by step a bit steeper. It's tiring if you adjust them too steep right at the beginning.
My guess is that you have too much forward lean on the front that shifts your center away from the board middle and thus you have problems with keeping straight... I'd say; put them back into a neutral position and if you're able to keep perfectly well the line you want to ride, then begin with add lean to charge harder backside turns.
On a side note... I’m a bit concerned if you talk about “charging”, but something like adjusting high-backs can damage your balance/influences keeping your line…
Don't "charge" if you're not in control. Take it easy, and first develop balance/muscle memory.
From your other posts I take, that you're beginning, so it might be, that you have too much forward lean and not yet the balance to coordinate knees/upper body with that. Think of the high-backs as amplifiers, but the amplification can go in both directions: they can enable to ride harder, but as well completely screw what you've learned so far. Every part of your body should "know" itself what it has to do and work independently Test your balance on a not too steep straight run. Point down straight line and mock around on the board, hop, swing your arms, turn the upper body, look back, shift weight quickly from front to back foot and vice versa several times, lean deep in your knees and do the same. Still keeping your line straight? If not, you just yet lack the muscle memory. It'll come by time