The Radeon are not 115W … they are more in the Wall...
Also you have to consider Risers + Fans  … You are really in the limit limit of the PSU

And also I hope your cards don't die soon... this is the worst 5700XT in terms of memory heat...

This is the reason why Asus make the TUF EVO... for the mistake of the memory disipator... I hope you try to make some mods in the backplate or something...