Ok as someone who has tested this to an extreme amount on leaning trees, I have a couple questions… are you planning to SRT climb and then worried that you won’t be able to get your platform set on the high side and then get up? Or are you planning to set your platform and SRT climb similar to how guys one stick and make multiple moves and pushes to advance your climbing line? If it’s the first one, depending on the severity of the lean, you can get up to the high side but your climb will most likely be from the low side due to gravity. In these situations, if the tree isn’t too big around, I usually set my platform about 90 degrees from me, so I can use it to toe myself over onto it. You can also set your tether with the hitch pulling from the high side and use it as a handle assist/pull rope. Then once perched, you can let out a little slack and pull the platform as set it again fully on the high side. If the lean is pretty gnarly, I set a ring of steps and use a long lineman’s rope. I toss it around the tree, use it to pull myself in tight to the tree and steps, and then set the tether so that the girth hitch is pulling from the high side, and using both the tether and the lineman’s rope to walk around to the high side. In those instances I also keep my lineman’s rope on while I hunt just in case I need to walk to the back side of the tree for a shot opportunity. Its comfy on the high side, on the low side not so much but it works and I’ve done it on trees some guys wouldn’t even think about using.
Now if you’re planning on climbing similar to a one stick guy and pushing your SRT up in increments, it’s never been an issue for me. Just hitch so that the rope is pulling from opposite of the lean and side you plan on climbing. You can always use your set platform to help toe over if gravity does start taking you. Not sure if what I’m saying makes sense lol