For tren and masteron i would backload slin pins for the week (drawing with a 23 gauge of course).
So then you've got your back loaded little slin pin with thick oil in it. Grab a hair dryer, hold it upside down, and "roll" the tube back and forth over the hot air. Do this for about a minute. It still takes about 50 seconds to push a CC through a 29 gauge slinpin but the benefits far outweight the inconvenience.
I've done this with some THICK oil too and it works like a charm. For frequent prop/ace injections, this is THE way to roll.
I'm ok with being called a pussy.
Pussy!