I thought about the following:
My skin is prone to ingrowns, therefore I try to avoid shaving ATG at the moment. However, since my beard is quite thick and dark, the residue is clearly visible. That is not very satisfying, but I can live with it.
Now, ingrown hairs are caused by a too "BBS-esque" shave, cutting the hair below the skin surface. It is obvious how to avoid that: don't go ATG, don't stretch the skin and live with the stubble left.
What if we were to try and shave against the growth pattern while taking care of not shaving too close? Warm water causes the skin to relax, the hair to move out of the skin, thus allowing it to be cut off easier and nearer the skin surface. Agreed on that one, we therefore just prep as usual, hot water, towel etc, first and second pass as usual.
On the other hand, cold water causes the skin to contract, the hair might be "pulled" back into the follicle and won't stand out of the skin in a way as it would if soaked with hot water.
The suggestion is simple: cold water rinse before the last ATG pass. The hair has been softened and shortened by the preceeding passes, while the cold water might prevent that the hair might get cut somewhere below the skin (since it is already contracted).
Any ideas this might actually work?