First time grow question

[tigresporos]

Hello so this plant is my first grow , on vegetation it went through stunt growth since i over watered and exposed it to high temperatures .
learning from my mistakes i recovered , did some LTS on it and my result is a dwarf plant trying to produce nice buds but i got a question baffling me hard.

So my question is , while the main cola looks like its nearly ready to chop , other branches seem to be in early flowering stage.
they havent developed at any point close to main cola and look like they need much time more .
what should i do about it ? just let it grow ?
chop in a few days main cola and let the other branches fatten up ?

PHOTOS

Spoiler: pics

So all basic info needed .

What Strain is it?
AK47XCHICLE AUTOMATIC
Is it Indica, Sativa or Hybrid? What percentages?
20%Sativa-80% Indica
How Many Plants?
1
Is it in Vegetative or Flowering Stage?
flowering
If in Flowering Stage... How Long?
Plant is on 75TH day since sprout.
Indoor or Outdoor?
indoor
Soil or Hydro?
Soil
If Soil... What is in your Mix?

Organic all mix with wrong general ph (it had 7-7,5 ph , i think t his soil has produces me problems as well due to high ph even though ive lowered it)
If Soil... What Size Pot?
8L
Size (Wattage) of Light? How Many?
250W HPS 16 HOURS / 24H LED FULL SPEC LOW LIGHT 80W
Is it Air Cooled?
intake exhaust recycling air
Temperature of Room/Cabinet?
20-28C
PH of Medium or Reservoir?
6-6.5 Feeding mineral water with lowered ph (6.0 -6.5)
Any Pests?
How Often are you Watering?
every other day about 500ml ( plant even though its on flowering it takes up water very slowly and soil turns moody and light)
Type and Strength of Fertilizers used?
5ml per 1,5l BIOBIZZ BLOOM
Size or Square Footage of Room?
about 0.8M2

 

[Old Salt]

Use a 30X or greater magnifier or microscope to check the trichomes on the colas. Harvest that main cola if it's ready, then the others as they mature.

BTW: It looks like you have a nitrogen toxicity problem developing. This is indicated by the dark leaves and clawing. I'd ease off on any nutrients you are feeding them.

Have you read @Emilya's "The Proper Way To Water A Potted Plant?" It's a good reference for growing in soil.