[Bruce]

Nigel.

First thing----DO NOT FLY till you figure out your fuel flow problem.
You are asking for trouble.
There are plenty of guys out there that can help you.
I would change the filter to paper if you can. Don't know how much oil
you used but don't think that is the problem.

Pull off fuel line to engine and do a fuel flow test.
Check the mixture lever and make sure it is hitting the stops.
Do you run it full rich?? or are you leaning??
What is your egt's showing 1200-1300??
CHT's300-400??

Give Walt a call if this doesn't help.