Wow – you certainly live up to your Mad name Bill coz that Dartmoor loop is a stonkin epic mate 😕
The BW between Peter Tavy & Bellever via Cocks Hill 😉 is an absolute bog-fest and would probably be more of a hike-a-bike than a ride. I hope you have a camouflage colour bike too cos you do realise that the route goes through the Merrivale MOD firing range – in coming!!! – the last time I was up at Princetown they were in fact live firing on that range.
I agree that the Sherberton farm to Whiteworks is another bog-fest. The route is a series of posts marking the way if you can find them & the streams can be very 'interesting' to get across especially after some rain.
To be honest I have ridden fairly regularly on Dartmoor & I wouldn't want to undertake your route – Sorry – I would stick to something a bit more rideable rather than trying to go over the open Moor which is a nightmare.