26gx 1" is the best I've found so far, I wish I could find them in 1.5" though. I agree with these guys here no less than 1" and 1.5" is best for those large muscles. I got bad info when I started out using aas and was using 22 and 23 g and it jacked my shit up. There are certain parts of my glutes and quads that are crunchy as shit now. Go small and long man. Some guys even will keep a big 22 just for fast drawing and switch to a smaller pin for the injection. The little guys are very slow to draw oils and its getting annoying lol.
27g 1 1/4 is an option. Warm oil and shouldn't have problem especially 1ml syringe.