ghost,
remember that you dont need a lot of injections to increase your risk of developing scar tissue. the BA in it does it quite quickly unfortunately. It does sound like you have scar tissue. a few things I might suggest:
1) if you're using 25gauge you might consider changing to a 23gauge pin.
2) use a smaller syringe....pushing gear out of a 30ml syringe is a lot harder than pushing gear out of a 3ml syringe.
3) dont poke the same site more than twice a week. rotate sites: left glute, right quad, right glute, left quad, shoulders, bi's, tris, repeat cycle.....or something to this effect.
4) dont work out the muscle group sooner than 3-4 hours after you inject. all that fascia and blood exacerbate the formation of scar tissue if put to heavy use.
5) massage for 2-3 mins after you pull the pin out to get the gear as evenly distributed as you can.
scar tissue rarely goes away, if at all. if it does, its damn slow from my personal experience. dont worry tho, your gear still gets absorbed nicely
hope this helps,
Skywalk