Sorry to hear about your first shave with injectors. I just had my first and second shave, yesterday and today (both extremely nice shaves), but take all this with a grain of salt as they say...
1 - I've read where some say that the G series is a mid-level aggressive razor. I've started with a J series - with a mild reputation.
2 - I resisted using blades that came with the old razor and instead purchased a pack of new Schicks (made in china). Cleaned the razor also.
3 - Technique - Finding the angle.
- I started with the most shallow angle possible (the flat part of the razor, and the blade, are flat against my face.)
- As I take a slow, deliberate stroke (no pressure) I adjust the angle.
- When I hear the sound of "velcro separating" (as some describe) I hold that angle and continue my stroke.
4 - I back off the "Velcro angle" just slightly (I find it less smooth than I care for) and try to keep that sound throughout the shave. But for now, I'm always starting each stroke with the flat side to my face in order to center my focus for each stroke until the angle becomes habit.
It's working so far and hope this helps you.
Keep working it.

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