Close to harvest, should I keep feeding?

Hello, I just finished 8 weeks since I switched to 12/12 and I know it’s normal for leaves to turn yellow towards the end but some of them are also brown at the tips and have a few brown dots on them, I’m thinking it might a potassium deficiency or heat burn. I’ve used the GO Box from GenOrganics throughout the grow but I’ve stopped feeding them at the beginning of week 8. I’ve read mixed reviews on whether I should flush these nutes so instead of doing a full flush, I just decided to clean out the soil by using plain water for the last couple of weeks. Ever since I did, that’s when the yellowing/browning started. Should I have kept feeding them or just leave them be until harvest?

I’m thinking they should be done in a little over a week so I was going to leave them alone, what do you guys think?

pics?

I tried to edit the color to match as close as possible since its under HPS but you can see where the brown parts are

vostok said:

Thats great idea especially if you are not totally familiar with these nutes,
it will take a couple of grow for you to be comfortable ..!
and avoid these burning moments ..lol

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That's true, thanks for the input! I'm just going to let them finish off with plain water I don't think anything really bad can happen at this point (besides mold and pm of course but thats under control)