Others have covered you pretty well so I'll give you my experience because I was in a similar spot this year. Knew I wanted to shoot my bolt guns and ARs suppressed
I shot my fathers TBAC p223 (comparable to ultra 7) on my AR and after one shot, it gave me instant tears from the gas and I knew this couldn't be the way. My ARs do not have adjustable gas blocks
Bought a TBAC Ultra 7 for my bolt guns, meanwhile researching LBP or flow through cans for my ARs. Settled on HUXWRX Ventum 7.62 and have been very happy so far. The Ventum stays on my 16" 223 and has helped me killed a handful of yotes in the past couple months. If i could improve one thing on the Ventum, it would be the weight, althought it's not terrible as is. My TBAC Ultra 7 has only been shot on my new 7PRC and I love it, recoil is modest and so quiet compared to the brakes I used to shoot.
A friend of mine got a B&T SRBS 762-DM for his AR and his experience is similar. Great for rifle function and love its sound suppression, just on the heavy side especially because he has the ASR QD system.
To address the heat topic, yes things get hot, but my Ultra7 with a cover doesnt have much issues here in AZ when I shoot a group and let things chill for a bit. I slide the supprerssor cover rearward onto the barrel and let the can cool, it cools quickly. Without the cover, you will have heat waves after a handful of shots. Dont plan on touching the can bare-handed after its been shot and you'll be good, just takes a leather glove if you need to.