You have a nute deficiency. That golden-yellow spotting that becomes systemic (thoughout the entire plant) is most likely magnesium deficiency. I think your pots are too small at this stage and you should replant into in bigger containers, 5 gallon buckets are good for this stage. If you have a hydroponic/indoor grow shop around you, I'd spend a little and get some Foxfarm ocean forest potting soil or the Roots brand. You can get something similar at Walmart or hardware store but those two soils are designed more for indoor growing. The bigger problem I think can be solved with giving the right kind of fert. You don't mention much in the way of adding fertilizer and your growing in coco, which probably doesn't have any added ferts at all, so you get to do this as the grower. I usually advocate getting some Dynagrow fertilizer as it has pretty all the micronutrients that plants need, including magnesium, which I think those need. If it really were bugs I don't think you'd see such widespread spotting. Since it's all over the plant I'm thinking you have a nute deficiency. Transplant first, then use about 1/2 teaspoon of the fert in a gallon of water and give that. Wait a couple of days to see what the response is. Since you'd be giving another fert, you can stop the bat guano or whatever else you have. I don't think guano has all the nutes that plants require anyway. The drawbacks to Dynagrow is that for soil, you don't need much of it so you end up with alot left over. This fert has phosphorus and calcium which are attracted to each other and over time, will bind to one another and sink to the bottom of the container. Thus it does not have a long shelf life. But it's a good fert that will give good results if used right. The contents and directions are on the back of the bottle. You can use a different fert if you want, but you need mg in it to solve this problem.