Blueberry Cheese

There are few leaves which have some markings/spots. They are like yellow and both plants have those but i haven't see any pests. If someone knows better im happy to know more. Can it just be because i started lowering nutrients and 29.1 i started to flush with Flawless Finish. Im planning to harvest close to 11.2 then they have been flowering 60 days and some of trichomes have started to turn little bit amber but still most trichomes are milky and there are more clear one than amber ones.