wrap your vials in a heating pad for about 10-15 min before you draw them out, much more sanitary than water option. I personally pin traps, lats, delts, chest, tri (usually slin pin), both glute locations, and three quad locations, the “clogging” thing will be helped by warming the compounds first but t300 and deca300 are fairly thick compounds unless the source is using poly guaiacol but with it turning milky when mixed i would almost bet the source is using poly in 1 of the 2 and guaiacol in the other of the 2, in which case the milky would happen, however poly would be a very unique agent to use in either of the 2. I have hit bi’s a couple times in the past, you are correct in hitting outer head but i personally never could perfect it, hope this helps