Is this a Calcium Def?

Quick breakdown:
Nirvana Bubblelicious in 3 Gal of 50% FFOF, 25% HF, 25% perlite
FF Trio at half strength, following their schedule (last feeding 2Tsp big bloom, 1Tsp grow big, 1Tsp tiger bloom)
Nutes fed every other watering
Tap water, left out 24 hrs, PH'ed to between 6.3 - 6.8
Under a 300w MarsHydro with 5w LED's, 18 inches above canopy
Temp with lights: 81F, Lights off:72F, RH: 50-60%


Things I've tried:
Added CalMag to every watering (2 Tsp)
Scratched gardening lime in (1Tsp per gallon of soil)
Flushed 2 weeks ago with plain PH'ed water (3x volume of soil)


I've been battling it out with what I've been treating as a Cal def for about a month now. Things have not gotten any better with any of my researched solutions. Any advice would be a great help. I'm currently going in to week 5 of flowering and its now spreading up into my sugar leaves. Buds seem to continue swelling, resin production looks pretty good. I'm really slamming my head against the wall on this one. Any advice would be greatly appreciated. If any additional photos or info is needed please feel free to ask. Thanks everyone.

Looks more to be a phosphorus deficiency to me.

It's looking like that could be it, my next feeding drops the Grow Big and calls for only Tiger and Big Bloom. Maybe I'll try a feeding of full strength instead of half and see if that helps.

I would still run half strength for the first dose to see what happens. Half dosage will not let it progress further, just maintain until you are 100% sure that is the issue. If it is, then go 3/4 strength for a feeding. If you see improvements after that, then go full.

Just wanted to say thank you, Delta9. The more I've looked into it, the more it is easily diagnosed as a phosphorus def. I did notice that leaves directly in light were being hit harder than those that were not. I chalked that up to the lack of calcium not helping her to be able to handle the heat of 5w LED's (they tend to shoot lasers, or so I've read) Looking at photos of effected leaves are identical to mine, and the descriptions match to a tee. Thanks again.

Not a problem! New to indoor...veteran for outdoors, I'm relearning all over again!