Rear mech shifting Issues

geoff93

Hi all, I’m having trouble with my Sora rear mech. It’s just not shifting well in the largest two sprockets. I can set the indexing perfectly for the others, however, if I adjust to get the top two working well, the rest are out of index. I’ve replaced the gear cable and outers, I’ve recently put on a new chain and cassette. The rear mech hanger is straight, I have checked with tool. Rear derailleur has been deep cleaned and relubed. Are we thinking rear worn mech?