dude i just used 1.5 ml/gallon which is what a very professional grower friend who has been using theproduct foralong time recommended. havent had any burn, but havent had much slowing in stretch,,,maybe you could go higher but expect burn...its only been 6 days of flower, but my og sure love the BM.
stick to 1,5 -2 range im thinkin...IMO...
also cheked out ure journal.... would love 2 see what happens if you only us bm on one side.,. that would be so sick for comparison...ill have some pictures up soon, havin trouble ATM!!!