I'm using SCS v30 with Item Revisions v4 (beta 8) on BGEE and I noticed that SCS does not install fine/excellent weapons while IR is installed. I'm not sure if IR ever implemented its own fine/excellent weapons component but certainly the latest version doesn't seem to. So I manually commented out the check for IR in the tp2 for the "Replace Magic Weapons with Fine Versions" and the "no-shatter" subcomponent (the "shatter" subcomponent didn't have a check for IR).
As far as I can tell they now work fine (pun intended ). Assuming noone else finds a fault running IR with these components, perhaps the checks for IR could be removed in the next version?