I had earlier posted a request for advice and had many helpful responses. Since then I've sent my razor back for rehoning and have kept shaving, experimenting with all the variables everyone has mentioned.

Today I had a breakthrough - very smooth shave, no burn. Still not as complete as my DE in some problem areas around chin and jaw, but a quantum leap. A few things that may have helped:
1. Continued efforts to keep the pressure light
2. Recognizing that ATG in some areas was really a diagonal stroke.
3. Moving my arm and not my wrist, which helps keep blade angle stable.
4. Gentle use of the "scrubbing" technique in some small areas.

Still had nicks and spots that need work, but I thought it worthwhile to post this for other beginners who may be frustrated.

Thanks to SRP members for all the helpful information.