You did not say if you can shift up to the big ring? If you can and the der. rubs against the ring even though you had it positioned correctly with the original proceedure, the cable tension is too slack. Start over and follow the Park proceedure, either from the Big Blue Book or online, exactly.

Lack of trim function on a Sora triple is a pain. Makes lots of gears unuable due to cross chaining and no way to correct it. Makes you wonder why the mfg. would ever put it on a bike.