Don't forget though that DynoDynamics dynos are notoriously conservative with the figures they provide, many people refer to them as heartbreakers because of how they can make you feel after a session on one if you then compare your figures with someone else who has been on a different brand of dyno.
I absolutely wouldn't be too worried about comparing your figures to anyone else's unless they have also been dyno'd on that same machine.
Did you not get a pre-tune stock dyno run done on your car on that same DynoDynamics machine, after all its all about the delta not the figure.
Very true. I've learned a bit more about dynos since this run. The tune and downpipe alone knocked 0.9 s off my 1/4 mile and added 10kph compared to stock in near identical conditions so although I didn't dyno prior to tuning, that probably equates to around 30kw atw? It's more than enough power for me now.