Floranova bloom is almost worth its weight in water, if only you didn't have to shake it for 5+ minutes everytime, lol. Best most easy going grows I've grown/seen was nothing but bloom all the way through, minus a sore arm.
I hope you guys are wearing masks when you mix jacks part A so often. I'm more scared of breathing that dust than catching the coof. No heavy metals but still not good for your lungs.
I shouldn't even have to explain why the little calnit balls that f%^&ing go everywhere should also be mixed up once every few months, haha.
Rather just mix up 1 gallon concentrated jugs that last for a grip.
Nothing wrong with mixing by volume after so much experience.
Instead of smaller syringes though, maybe you could just use one of those dual measuring bottles (like canna zyme comes in):
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