I add 3.5cc to the golds. I double pierce the stopper using a 31g insulin pin w/o plunger to vent, and slowly add the BSW with a 27g syringe. Have probably gone through six kits of gold, first three vials from one did not mix clear (Opti credited me for it). Others have mixed clear enough. Many high IU vials I've tried from Opti and other sellers have some very, very tiny floaters/aggregates/particles if you look close enough, but below my threshold for concern.
I was using 7.5mg a day (4 iu before bed, 1.75iu am, 1.75iu preworout in pm) but more recently dropped to 6iu (4iu before bed, 2iu am) mainly to have just two injections, and have my serum GH nadir when I'm eating carbs pre/intra/postorkout.
Also added imeglenin pm (to limit overnight gluconeogenesis with peak serum GH levels) and take Jardiance 10mg in afternoon to limit evening blood sugar spikes and for renal/cardiovascular protection. SGLT2 inhibitors can increase Hct but mine seems to stay controlled now with telmisartan, naringin and silymarin; and maybe more important switching primarily to shorter esters which give daily peaks and troughs versus steady state levels.
I gave up metformin a while back. Besides the imeglenin, on high carb days I instead use ATX-304 (research chem AMPK activator) which seems to work vastly better without any side effects. Seems to be very promising for recomp.