Hi Mark,
The pond at Penrith is deceiving for speeds. Pauls boat has definately run faster than low 50's - I've seen it run heat times not possible at those speeds. in fact Paul's and My 21's often run faster heat times than all but a few of the 45 riggers at events.
Heat times tell the real story. At the recent Hunter Valley champs, the best heat time for the event was set in X hydro by Ian Inverarity with a seriously quick single powered by a RS101 at 1.02. Grub's best with a Cajun twin with RS91's was 1.03. Paul's best heat time with the 21 ( in traffic) was a 1.15 and mine was a 1.12. Now I know for fact my boat runs faster than low 50's (L/S nova with a few mods, SPP TD21, P4U H4 @ 3.75".) Hell, It got clocked at over 60 with a blade missing off the prop once with a stalker pro gun.
I don't know if he's changed it since HV - I can't watch the video (firewall)