Ok well I reported a flat battery at 9.48 minutes based on the motor shutting down and doing a dead stick landing - however, when I charged the battery I only put 2280mah in, not 3300 so I'm going to change out the speed control and install an 80A OPTO V3.1.
To be quite honest I have no idea what the current speed control is (hard to believe but true.)

I'll hopefully get to try this tomorrow morning and see if that works better.
Cheers

Turns out speed control was castle creations Phonix-125