Hey ,Warmane, are you specifically lowering trinkets droprates?
I have resto druid almost preraid-bis. The things i need are healer trinket from bm an healer trinket from botanica. I ran like 15 bms and 10 botanica with no trinkets even dropping. In 15 bms no hourglasses and no scarabs. Imagine that? The same with botanica, haven't even dropped once.
Can't say I know for sure of course, but based on my BM runs, I'd say you are getting fairly unlucky. Ran 6 normal BM so far, got 2 hourglass and 1 healer trinket.
If they screw with drop rates of trinkets, it will be for raid drops, like the dragonspine trophy that everyone and their mother is likely going to buy.