thank you for the images.
Why don’t you use the transparent A-Foil of Laser-Dark (No-Cut) for white transfers?
With which color are you printing? If you are printing with white on the white A-Foil, make sure that the density of white is on +3.
If you still have problems, please print the design also with black, as recommend for normal CMYK printers.
And yes, increase the pressure for trnasferring B to A and use the maximum pressure for transferring onto the shirt.
When removing the A-Foil from the shirt, do that as flat as possible. Roll the foil from the shirt instead of peeling it.