Need help flowering

Flowering has been kind of slow and the leaves are a blueish tint outside with light green on the inner I don’t know if its the strain or maybe nutrient problem I’m growing the strain Purple lemonade autos I planted in pro mix
Hp with a little bit of coco and cast and frass super soil the nutrients I have been using is
Homemade from
Garden centre
Total Nutrition Plant Food 3-1-3 is another product in the Happy Hydroponics Signature line of plant foods! ** PH corrected, with a full compliment of elements! **
PH corrected means no complexing of vital elements with other ions that can prelude plant intake. Your plants take advantage of the complete fertilizer. Total Nutrition means NOmissing elements. Calcium and magnesium, not found in other liquid fertilizers, are here – along with the other 10 elements essential for healthy plant growth.
DIRECTIONS: USE 5ML (1 TSP.) TO 1 LITRE OF WATER
Guaranteed Analysis

• Nitrogen as N 3%
• Potassium s K20 3%
• Magnesium 0.4%
• Zinc 0.008%
• Boron 0.003%
• Molybdenum 0.0014%
• Phosphorus as P2O5 1%
• Calcium 1%
• Iron 0.015%
• Manganese 0.0074%
• Copper 0.0014%

So was just wondering if the plants growing slow during flower because of not enough phosphorous maybe. I planted from seed April 2nd. Any help would be appreciated I will attach pictures

Yea generally you want a much higher range of phosphorous in your flowering feed . Plus after the first few weeks of flower most strains don’t grow much more leaf and stem as they spend they’re energy focusing on bud development. what is the temps like outside where your growing that could play a big role in slowing bud development growth if it is too hot or too cold that could slow growth substantially , as well as wild temps swing too.

looks like high or low ph but l know nothing. Do you test? Or just go on companies word? Are you sure its not 5ml per gal.?