Spacers for Rega P3

Am I the only one who thinks that the tonearm in the Rega P3 is mounted a bit too low ?
It seems that it needs to climb a few mm on its way to the record.
The solution is very simple: a spacer... but wouldn't Rega use a spacer on the stock P3 if one was needed ?
Should I add a spacer ? What size ? 2mm or 4 mm ?