that's exactly what you want to do. even with variations from strain to strain, healthy is healthy. they have problems for a reason, and the reason is usually you. learn what they need and give it to them, with no extras. extras are almost always the cause of problems. if a little is good, that's all it means, that a little is good, not that more is better.
a scope is very nice to have when trying to figure out when to chop, but the general health of the plant, the state of the pistils, all play a part in the decision. the better you know your plants, the better weed you'll harvest