yellowing leaves early flower

Hi everyone, I'm getting a bit worried about my girls. Think different and Auto Mazar both in week 7. 2x2 tent In canna terra pro soil plus 30% perlite. Both were very healthy up to week 6 when I switched to hps 600w. Had some heat issues but under control now. I've been feeding fairly...

So this is the first REAL scary issue I've encountered yet with my gal. After feeding her some banana tea the other day, I noticed her buds getting bigger & fuller but her leaves also started getting more & more yellow & crispy starting at the bottom. It looks like a typical nitrogen...