Just asking if everything is normal because i have some colouring and some and most started a little amber one of the pictures you can see that they change

Thats normal, the plants are sucking the vitamins and shit out of the leafs for big buds 👌🏼👶🏻👌🏼 At night maybe 2 degrees more.

Correct, at least 3 maybe 4 weeks to go. I have had plants that at this stage already had 75% amber trichomes and were nowhere near harvest maturity......it was a genetic thing. Once you have 98-99% brown pistils/hairs, you will be entering the harvest zone. Remember to check the trichomes on the calyxes, they are the ones that matter, not the trichomes on the leaves.

Looking really good judging from these pics, keep feeding for another week at least don’t even need to go full strength especially with the heat

The reddish/purple is probably normal... if temps drop to 18C and below, it could be exaggerating the Autumn colors, but could also just be genetics. Stay above 18c as best you can at night. The paling of the canopy is the plant cannibalizing the leaves. This is fine as long as the canopy doesn't not deteriorate too fast before you get to harvest. Don't be afraid to feed a plant if the progression of the deficiencies is too fast. Don't be afraid to feed anytime you aren't over-fertilizing for that matter. It's a myth that you need to 'flush a plant' at harvest. Don't starve it. Seems a bit early to check trichomes... you can find amber trichomes at various points - especially on preflowers that are older than the rest of the growth. If the colas aren't fully plumped up, no need to check trichomes, yet. Humidifiers are fairly cheap, so adding one would help the RH situation