I always get a bit nervy when this happens. My usual reaction is to take the decal off and put back in the water to clean off the Micro-sol and clean it off the model, then put the decal back on the model and reapply the sol very sparingly.
I have had decals that have rolled themselves into a ball that I have resurrected. Takes a long time and patience. If its really bad I'll get it straightened out in the water dish, slide the old backing paper back under it so I can lift it out without any curling and re-place on the model. I'll use a tissue or something really absorbent to remove any water then apply heat (hair drier) rather than the Micro-sol.
How has it gone since you asked the question?
Kia ora,
Mark
"Time flies like the wind, fruit flies like bananas"