Yeah so bit of an update- Just got back from TGM where Tom test drove it and confirmed there was a crunch, but couldn't identify exactly what was causing the issue without replacing various components. He mentioned there was some play in the gear leaver housing/linkages, but he couldn't say for certain that was causing the issue without replacing them with new ones (understandable)
Because he couldn't confirm 100% it would fix the issue torque GT didn't want to pay for the work to be done under warranty.
So basically now I'm saving up for a K-tuned billet shifter in the hopes it will resolve the issue. I will also try all the tips above in this thread.