Proposed changes for underperforming jobs
MCH prio number one at this point.
I think a good starting place would be a flat 5% damage buff, in the form of giving the vulnerability down back, or a personal vuln down like NIN's current Trick Attack. This would be unique enough as a raid buff that it would be good for speed kills, and make it interchangeable with NIN otherwise. If you want to keep the job "selfish", then a personal vuln down buff would still be unique and achieve the same thing. The Mishit window is around 5-8%, so a flat buff would bring it in line and slightly under similarly performing jobs i think.
RPR i dont know why arcane circle is 3%, when it should have always been 5%. In addition, it is a very resource heavy job with a funky 124 loop that also somehow made it through testing. With that said, generating resources in down time is probably also needed. Casting Soul Sow could achieve this, as well as possibly give some when harvest moon is used.
RDMa harder hitting melee combo to start, and some form of faster resource generation. After some thought, I think 90s Manification may achieve that. Some other very slight potency values may be needed as well, but I think the melee combo and manification are a good starting point.
These seem to be the main 3 in the most need. I know other jobs could use some slight changes as well, but the ones that need it most should be a priority, and then proceed from there.