Vid of Slash with 2.5T LT motor vs GTP Plettenberg

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What ESC are you running in the GTP?

If its the MMM, you may want to hook up the Castlelink and create a custom throttle curve to that exponentially increase to help the hole shot instead of trying to manage it with your finger. This way you can mash the finger and the MMM will do the thinking every time.
I see in your sig it says the RX8 esc, I'm not sure if their programming can do the custom throttle curve, but its definitely something to look for. That should help you create consistent and strong launches.