Rear spring options/matching to shocks?

Hello everyone, I am new here and this is my first post so hey!

I have definitely done my reading on every spring, suspension setup and option that I can before asking.

I have a 2007 V6 limited without rear air suspension.

I also have a radflo 2.5 front and rear extended travel kit with spc UCAs, and 275/70r17s on Trd pro wheels from my FJ.

When I had my FJ setup for my use I felt that the back was too high with the eibach 2" rear springs that radflo provided.

I have no extra weight in bumpers or winches, but I do plan to tow near the limit and likely install airbags. I also offroad and bottomed out my stock height FJ enough times.

should I
1. Use my 2" springs with a higher rate, matched to my radflo shocks and assume the 4runner is heavier than the fj at the back? ( this setup did make my fj drive quite a bit worse on the road and left me with pretty big wheel gaps. it will also increase my driveshaft angle which could matter for towing?)

2. 4runner springs with airbags, Maybe small spacers for some height. They are a bit soft however and I can not imagine them matching too well with my heavy radflo shocks. Or do the spring rate and shocks not need to be matched? How about travel.. Will the shorter springs fall out potentially?

3. Fj rear springs with spacers and airbags.

4. Another brand of spring? likely with airbags.

Just looking for some input! I know there are many brands of springs. Looks wise I think the stock rear height is pretty good, But remembering my fj lifted, it looked too high with a big wheel gap in the rear to me.

Thanks in advance!

 

Welcome.