|Definitely try the 85a wheels. That will work better on asphalt. It will be a bit gummy on skatelite and ramps, but not enough to trouble you.
As to your spine issues, it would help to see video. I think, from what you are saying, that it might be best to just 'barely' air over the copings. Either that, or try to stall on the coping of the ramp you will be going into, and not the one you are leaving. Then, just roll into it.
Really happy for your progress, Claudine!! Good luck!!!
(post video of that spine transfer!!)