I'm not an expert or even a grower, I just started my 1st plant. But I would not cut anything down personally. People are quick to say chop chop, but they usually have bigger or massive grows and cannot afford to have them contaminated, they also have ready to go clones, and a full cycle going etc and are doing this more professionally. So it's no big deal for them, they lose a few weeks and keep everything pristine. Bugs are part of reality and nature with plants. Unfortunate the little buggers got so advanced, but if it was me I would try to knock the bug problem down like you are doing, monitor more closely than you have been, and read as much as you can about the issue.
Chopping is easy, trying to save your smaller grow is the harder part. You might get all those plants with a few bugs in them, your yield might be less, you might lose the harvest entirely because of bugs.. Who knows, but one thing is for sure.. You cut the plants and trash them and you lose the harvest for sure. That's just my 2 cents as a non expert, it's up to you because they are your plants. But the plant is in bloom, and many people have saved plants much much worse than that. They are adaptable, and with help can fight the bugs. I'd clean your setup as much as you can etc.