Your dead right Raz....funny thing is I started slicing about a month after I started using my TM burner....no idea why it started a month later and not straight away BUT I was at the range yesterday and tried a few things like (as you suggested) close the club face even more which felt really odd and I also pointed the butt of the shaft less towards my left shoulder (all this along with better hand/thumb positioning and trying to swing more inside then out).....wha'lah no slice, just a very nice slight fade on a couple of drives.....was even able to put a lot more power into it too which resulted in easy 220-230m drives with range balls.
Problem was, walked up the 1st hole, set myself up as per above, wack and the bloody thing took off to the left like a bat out of hell, no slice more a miss-it than anything but it put me off driving for the whole game....funnily enough I shot my best ever score for this 9 hole course so go figure