Only just saw this, I’ve been moving house! Agreed that the stuff above Servoz is proper brilliant, not too busy either because you have to do road climbs to get there (no lifts). The descent from Merlet animal park to Les Gaillands is good too (fully detailed in Tom’s book). My favourite trail in the entire valley is from the Col de Balme to Catogne (there are two ways you can do this and both are good, both are on the map) and then down to Trient. It is not the hardest trail in the valley so you can hoon it, and it has awesome views.
If you want to really get out there and don’t mind pushing your bike uphill for about an hour, haul your bike from the Bionnassay glacier up to the Col du Tricot. The top is an awesome place, and there’s a great descent from there which is testing but rideable. You then get to the refuge and turn right, and there’s an epic singletrack along a gorge down to Champel. The downside of all this is that getting to the Col du Tricot in the first place is hard work and that puts off most people!
Loads of stuff in the valley itself too but I always seem to end up riding at either the top or bottom ends.
I may be out there in the first fortnight of October (I’m still pinning down my plans but this looks likely). I’ll have just finished a 3 week mountaineering course and will be keen to round off the trip with a good climb. If you’re in the area then drop me a line on this thread…