I never shoot myself in the glute as im not that flexible, and also i cant use only one hand to shoot, aspirate and all that. But however, i used to shoot my boys there and i get shot there myself when my friends are around and i can say that most of the times there is not much blood running, most of the times there isnt blood at all untill i press the pad afterwards to massage it in a bit deeper.
I guess it depends on the technique you are using, are you really slow to put the needle in or just jab it in, do you pull it out slow as well. I usually just jab it in and pull it out quick as well. But i have a friend that's a bleeder even if i use 25" gauge and its in a delt.