What's the maximum amount of juice (mL) you can inject in your Quads per week?

For practical reasons Glutes and Delts are out. (Can't self inject Glutes and no, I really can't find anybody to inject me! My Delts, I fear, are too thin, they are my weakest body part.)

I am doing Testoviron 500mg / Wk (2 mL) and Deca 400mg / Wk (4 mL) and currently doing 3 injection of 2 mL at a time.

If I rotate upper and lower quads (staying in the 'safe' area) and opposite legs, will there be any problems?

For example:

Week 1:
Mon: Left Upper Quad (2 ml)
Wed: Right Upper Quad (2 ml)
Fri: Left Lower Quad (2 ml)

Week 2:
Mon: Right Lower Quad (2 ml)
Wed: Left Upper Quad (2 ml)
Fri: Right Upper Quad (2 ml)

And so on...

There is never more than 4 mL per week in each Quad and every new injection in the same Quad is at least 3-4" apart from the last one. (I try to make an effort to cover the whole area of the Quad and not stick it in the same places.)

Yes, I know that you should rotate sites. Yes, I have seen spotinjections.com. No, I don't want to do bicep/tricep/pec/lat/calf injects.

I have been doing this for several weeks and so far no problems, but is there any possible downside that I should be worried about?

Thanks!