I use 23g 1.5" for glutes still as I'm injecting large volumes. As in 4.5-5cc. Gives me peace of mind knowing it's deep in the muscle and minimizes any leakage. 25g 1" for everything else. Just started doing pecs as of yesterday.
I'm a sterile freak though. I wear nitrile gloves and sterilize them prior to picking up the loaded pin. Also I recommend a nice hot shower prior to injection to loosen the muscle up and to thoroughly clean the injection site. Heating pad after injections works nicely too to help disperse oil and promote blood flow to the area to absorb the oil Depot. It's honestly common sense on hygiene.. Treat injections as if you're in a hospital/clinical setting and you'll be fine.