I think if you can see the RM with your magnifier, that is good enough. The cheapo microscope just gives you light to see so may be slightly easier.
For dosage, that sounds like a lot. I researched last night and saw dosages from 1 TBLS to 2 tsp per gallon.
RM on tomato plants will be the branches above where you can see damage (the brownish glossy look on leaves).
At this point, I think you just have to concerned with how long ago you sprayed Neem oil; that seemed universal.
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