DHB is one of those where you're either gonna get PiP regardless of what you do, or you'll only get PiP shooting it straight. a 100mg/ml DHB diluted down with other products to make an actual cycle shouldn't be a huge problem for those whose bodies don't hate it.
example, i've used 0.3ml of your test cyp, 0.6ml of your mast e and 0.5ml of a 150mg/ml DHB in a pin, 3x per week (180 test, 360 mast, 225 DHB). that's 0.5/1.4ml that's DHB, so the effective MG/ML of DHB is already much lower than 150mg/ml. didn't have issues with PiP.
its an utter pain in its own right tho to be using 50 and 75mg/ml preps of DHB cos the volumes of oil just gets massive.
its one of those compounds where a test+DHB mix is probably a good idea. something like 150 test e with 75 DHB per ML. 4mls of that per week 600 test, 300 DHB.