@Grant Taylor
Maybe consider giving up on the swings for a while? And just focus on grinds to build strength and proper movement patterns, and more importantly, to allow your back to heal.
Ive been doing A&A snatches up to 40kg since October. No issues. 2 weeks ago I made some changes to my training (I wanted to get back to basics too). Instead I've been doing Q&D instead of A&A. I used a 24kg, a light bell for me. I hurt myself a little bit. I was surprised, I hadn't felt back pain in a very long time. Especially since the weight easy light. I realized it had to be my form, degrading because I was racing against a clock. A few days later I tried again. Slowed down a bit and focused on form and I was fine. Even though I slowed down and focused on form, my set of 5 and 10 reps only increased by a few seconds.
Here are some thoughts for you to consider: (1) Consider putting the swings aside for now and focus on the basics and get strong,first. Deadlifts, presses, squats, pulls, etc... Heal your back. Focus on your core and proper movement. McGill Big 3, Stir the pots, front planks. (2) If you must swing, make sure your form is perfect (see an instructor). To maintain volume, keep the set volume low (10s or even 5s) and just do lots of sets. Focus on perfect form. Learn to stop before your back hurts, even if you havent finished your daily plan. Tightness comes before pain. Listen to your body. (3) After your swings. Lie on the ground and do the cobra yoga position for 10 minutes. I do this, in fact I'm doing it right now. It is what I am doing when I am on this forum, lol. Maintain good spinal hygiene throughout the day (see the book Back Mechanic if you arent familiar with this term).
Dont keep going down this same path. You may be able to manage it now, but down the road it can really impact your life (negatively).
These are things I do in my training. And I am someone who used to suffer with back pain. Good luck.
Regards
Eric