Also just wanted to correct a couple of points $waGgEr made:
1. pH is not too high at current level of 5.3 - it is too low.
Ideal Hydroponic pH range is between 5.6-6.2. Ideally, try to keep it as close to 5.8 as possible when starting out. Any higher than 6.2 and you are blocking the plant from uptake of Phosphorous, Potassium and Calcium and some other micro nutrients like Boron, Iron and Manganese.
2. You do not have way too many nutes, just perhaps a few too many extra additives?
30% strength for GH nutes @ 4th week of Flower is not high at all. Most people start flower at 100% every time as plants the size of yours should be able to handle 100% strength flower nutes no worries.
You should be running your flower nutes at 100% strength by week 4 generally if everything else is going ok.
If I was in your situation I would flush the res, add 100% GH 3-part flower nutes, drop the Rasta Bob "One Love" flower bloom enhancer and keep the CalMag & H2O2 going (how many milliliters is one capful of H2O2 and what strength is it?).
Looks like you have slight some nute burn on the tips and I have a feeling that Rasta Bob might be to blame. If you leave Rasta Bob out of the equation then at least you will know if it helped or hurt your situation further.
1gal = 3.8 Liters
Looks like you are on track though Nzime, so keep chipping away my friend!