I currently have a 21' 850 Khaos 155 with a Silber turbo, I tore up the stock series 8 2.75 with early season riding conditions and I am in the market for a new track. I am debating whether to go with the M770 or the M67 Composite track. I have never had a 3" track as I've always loved the 2.6 and now the 2.75. I have 3.5" pitch extrovert drivers. Anyone have any experience with either track?