When you foliar feed that late does it in anyway effect the taste? I have never foliar fed in flowering.
Short answer is no, not that I or anyone else has noticed anyways. It's good to rinse them off with a fine mist of [mainly] just water the next day, though, unclogs the stomata. Only "problem" I have noticed is, if the tea turned out very dark and I didn't dilute it enough, or very fine particles of compost made it through the sprayer... you can get spots on the leaves of a film\residue from the compost tea once it dries out. It makes the leaves look somewhat dirty, and in my experience these spots aren't always easy to rinse off (likely bound by bioslime).
After I apply AACT to foliage I always try to follow-up with plain water, or something light, like a fulvic acid\trace mineral supplement, Catalyst or even a low dose of blackstrap. As harvest approaches (about 2 wks prior), just bottled spring water as a fine mist to try to rinse off any dust, dirt, pet hair or other debris or residues. It is important to do this as early in the day as possible: either just before or shortly after lights on, giving them the rest of the day to dry out. I would not recommend spraying anything much later than 6 hours prior to lights out. I wouldn't recommend spraying anything in the final week of bloom. It is also important to consider your relative humidity, bud size and density. For very large\dense buds in a somewhat humid environment you need to exercise additional precautions; any foliar sprays should be applied in the morning first thing with no exceptions, no spraying in the final three weeks, fans on day and night for continuous air circulation, and humidity control if necessary. Otherwise you're just asking for bud rot.