I'm running a similar cycle. Test C 200 at 500mg per week and deca 200 at 400mg per week. That's 2 1/4cc's per glute each week. There's some soreness but nothing excruciating.
Make sure your practicing aseptic techniques. Hand washing, alcohol, etc. Try to keep a steady hand upon injection. It's probably easier on one side than the other so maybe having some help for the more difficult side would do it. Use a warm wash clothe and gently apply pressure.
It usually gets better as the weeks pass. From my experience.