Why is there ALWAYS a fucking problem during flowering???

Hydro DWC bucket
Full Fox Farm line of nutes
4 days ago my ph went below 4 and I had a couple of leaves getting fucked up because it can't absorb nutes.

Here is the new update album: [2] http://imgur.com/a/A9jkf
As of 4 days ago I changed the nutrient to 25% strength fox farm and 25 % strength botanicare cal-plus (there will be raging about this later).
First the plant is doing overall good. Ph is at 6.3 and temp is around 80. Now there's some more problems showing up as you can see there are some scorched mark on like 2/3 of the leaves now and they are upper fan leaves on a large side branch. I looked into it and it seems to be a boron deficiency ([3]http://www.growweedeasy.com/sites/growweedeasy.com/files/boron-deficiency2.jpg ) and a calcium deficiency ([4] http://www.growweedeasy.com/sites/growweedeasy.com/files/calcium-deficiency3.jpg )
but I need your input on this. Also on the last pics you can see there's bud leaves clawing and folding downward taco from nitrogen overdose!
Raging/Ranting: WHY AM I GETTING DEFICIENCY AND NITROGEN OVERDOSE WITH 25 % STRENGTH NUTE !!!??? I swear to god it is the cal mag as this happens to me more than once. The nitrogen in the cal-mag is ridiculous and it has shown to burn my plant more than 3 times with below 50% strength. I am never touching cal-mag again. Is there a cal-mag WITHOUT nitrogen? Why is it in flowering there's always a nutrient deficiency somewhere even if ph and every other enviromental factor are perfect? I see it in almost every indoor growth during flowering! When I look at outdoor growth the way the leaves dies are so natural and nice yellowing because the plant can search the whole ground for nutes. There's ALWAYS a nutrients problem indoor when you are feeding it and if you feed it just a bit more then it suddenly becomes overfeeding! I don't know if you can see it in the pictures but there's slight yellowing tip from leaves which means there's a tiny overdose in nutes. BUT I am fucking using 25% strength! I am so frustrated because I have over 100 huge fan leaves under and yet NONE OF them show sign of problems. Is my plant just fucken retarded and can't learn to use old leaves nutrients but rather use new fan leaves? I am so piss because in veg she was PERFECT and now only 2 weeks into flower and every possible symptoms shows up. This is the same for all my previous growth except back then I never bother to ask people online and just sit and let it get fuck.

Should I keep feeding it at 25% strength nutes? How can I fix this? What can I do to make my plant not getting one deficiency after another?

Why is there ALWAYS a fucking problem during flowering???

Click to expand...

Because its always too hot. If you cant keep temps under 80 during flowering then this will happen, reducing your final weight. Get some cooltubes.

Man... You sound like the PERFECT candidate for organic growing... Every one of these hydro nightmare posts make me glad I grow organically in soil. Soooo many fewer variables to mess with. Build a good soil (PLENTY of good recipes out there), put your plant in it, get a big cardboard box and put all your bottles and meters in it... Add water when thirsty.

Sorry I can't help with your current problem. All I can do is offer my suggestion to give organic growing a shot.

Cheers.

Am I reading this right that you're hydro and your ph is a steady 6.3? For hydro it should be lower -- 5.5-5.8...you can get some lockout above 5.8.

I would say drop your water temp to under 75 if you can and the ph down to at least 5.8. I drop mine down to 5.6 starting week 3 in flower. Also how hot is your room, how close are your keeping the lights and what is the ppm of the water you feed with?