Hello the purple color can be due to genetic but it can also due to fluctuation of temperature. If it is too cold during the night your plant will generate purple pigments called anthocyane. Then for your pale color it is because your plant consume her own energy from leaves because you maybe don't give her as much nutrients as it needs. Hope it helps you. Bye
Trace element, Mo not too much deficiency if is there, so keep going, it can be do too by genetics but till you don't see a slow down I'll go for the gen option.
It may possibly stress due to conditions maybe. But it can also be down to genetics as well. I have some Blue Jack that does the same thing near the end of flowering.
Sure it’s not ideal but you’re still making some nice flowers so just do the best you can to finish up this round.