XUD not starting when hot - Compression Test

[Harky]

UPDATE: 02/11/14

So brought the starter to get refurbed, there was a brush sticking on it. Got all sorted, but still the same issue with hot starting.

Did a proper compression test last night through the injector sockets, hot results were 385, 445, 370, 380 psi.

So a summary:

Starts the best cold.
Won't start hot.
Will start hot with a bump.

Valve clearances checked.
Compression checked.
New glow plugs.
Glow plugs checked to be getting voltage when hot.
Bosch pump running diesel, no cold start cable.

HELP! Right enough though, not sure what to try with this now?