Yes, I've been underwhelmed with that organ on a number of occasions, never more so than a wonderful performance of the Saint-Saens Symphony No.3 by the RPO, where the organ's entry in the 2nd movement was so disappointing.
As for your JR149s, I think a little augmentation will help sir's appreciation of the fundamentals - how about a nice REL? Unfortunately, I sold my Studio II a couple of years ago as surplus to requirements.

