I am not familiar with Rega gear, but I think that speakers are the most variable piece of gear in the chain of equipment. If you don't want to take the whole system back and start over, try some speakers that are known as having a warmer sound. I can vouch for Dali Helicon 400 MkI (not II).
You will probably have to get tube gear to reproduce or better your old system in this respect though.
You will probably have to get tube gear to reproduce or better your old system in this respect though.