Nope. I draw up with a 20g, switch out, and -bam-. 25g is fine for all AS including test and including primo. Maybe if I was using a 5cc syringe, I would do the 23g, but with a 3cc, 25g is as big as you need.
In fact, I inject too quickly. I inject about 3ccs in a minute. I once did it in about 30seconds...ouch.
i use 1 inch on my glutes, ever since i hit a nerve in my quad with a 1 1/2 inch and felt like i had a dead leg all day, i cant imagine having a dead glute...to weird