I'll put my two penny in.You are using alot of nutr,To many for me.
The organics do not mix well with alot of nutr,and dosent work well at all with cal-mag,Then using hygroze,peroxide,bateria,silica and some of the others too are fighting with each other and causing your PH to go up.You have a small res 10Gals,so it is a little harder to keep the PH stable as it is with lager 20-25 gal res.I did the same thing and that's what I found to cause my PH to go up.Now days I keep it simple GH 3-part & cal-mag to start,when flowering no more cal-mag or lower the ml's that you use.Flowering I use koolbloom or carbo load for carbs and to put weight on the buds.You are using AN nutr not all of there nutr are up to what they say.But there 3-part is good.If you dont have any problems with root rot or other root problems dont use peroxide or hygrozme,it kills bacteria and other stuff you dont want dead.Start of flowering I flush the system for 4-7 days and then start the flower nutr.This helps to drop the nitogen in the plant and will help it not to stretch as much.Do you have HARD WATER,if so use hard water mirco,it helps too.I stop using all the alot of additives and keep it simple and dont have any problems any more with PH.Somebody said it in a post,Draw your water put a air stone it it for 24 hours,then add your nutr and let them sit for 12 hours,Check the PH and adjust it to where you want it and let it sit for 12 hours check it and change the nutr out.I found this works for me and I stop having all those PH problems.Here's some pixs of the buds I get doing it this way. Hope that Helps. PEACE