So basically you have no idea of the balance or frequency of your inputs into a soil with known calcium problems - people keep adding it when they should not. The P-K looking problem is more likley too much than too little. The problem started a long time ago and is not likely to get fixed in time to help this plant.
It is not correct to just pick and choose products in a line you really need to use them all and according to the chart. IMPO it is better to feed full strength then water,water water, water, water. repeat. The reason I say this has to do with mixing the different products and bringing them to the desired balance.
The proper use of “salt” based fertilizer to grow Auto Flowering Cannabis. Salts: Natural and man made any chemical compound formed from the reaction of an acid with a base, with all or part of the hydrogen of the acid replaced by a metal or other cation. Learning how to use salt based...
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Because there is no way to know what is going on in your pot I would just use week 6 mixed at full strength then diluted down to 700 PPM PH 6.3.