Have you ever thought of upgrading the arm? For under a grand you could try the Audiomods Rega. Drops right in now you have VTA adjustment and is a big step up from the stock Rega arm on the P5. Not to mention you still have the Rega arm to sell or put on another table.
http://www.audiomods.co.uk/ordering.html
http://www.audiomods.co.uk/ordering.html