Thanks everyone for your feedback. My take aways from this a

1. Speak with the winch driver. I've had fast launches a few times with no reduction in power when signalling.
2. Get the airspeed under control early in the launch.
3. Release early if over speeding past the first 1/2 of the launch.
4. Smooth control inputs and don't give full up elevator towards the top of the launch if over speeding.

Thanks,

Dan