Sounds like ur right, too many minerals and prob alot of chlorophyl too. Was the bud n leaf really dark when harvested? Does it make some snap crackel when it burns? That together with the shit taste usually tells all. With good green veg I think 14-16 days maybe a little more of flush would be more beneficial. This usually brings mine to a pale green by finish which really makes for tastier goods. I have also found using a really weak nutient solution for flush one time at veg to bloom nutrient change washes away salts and what not better than that high dollar flush shit. I also think it may not be benefiting you to change tank every other day and have to try and get it ph stable before the next day. Try giving it at least 5 days in between dumping the tank and alow the tank and run-off water time to balance. The black strap is a good idea but I use it as a foliar spray a few times in the 3-4wk of bloom stage. It does have some nutrient values so be really easy on it.(lots of info on here and web) misting with RO water as soon as the light comes on will also help wash out chloro/nutes. Also, have you checked accuracy of tds meter, 110ppm sounds low for tap. But with a good formula the meter isn't a must. BTW I did dirt grows for years but after trying hydro for the first time I think it is much easier. Ha Ha... Ileft this response sit unfinished for too long and others pretty much said the same thing. LOL