I'd call Diono and see what they say, but also would probably bump the straps up to the next set if just slightly above the shoulders. I have some issue pullin our strap tight at the upward angle, but my button doesn't stay up...I also do not adjust after each in and out, I just leave it. And every couple days I have to tighten or loosen, which isn't too bad. It's just a little bit. I would not even consider turning a 20mo old, my 4.5yo twins (as well as both of my 2 year olds) are still RF. it may be a pain, but it won't last forever, and its worth knowing your kid is safest! I'd call Diono about the strap release button.
Ashli 29, DH Patrick 31
Hannah (4) Evann (4) LilyMae (3) Abigail (2)