I think the completely burying a haunch in salt is a huge overkill and can only end up with a very salty end product. I think it became a popular method when Hugh Fearnley Whittingstall took that approach with making a proscuitto with a pigs leg. When you bear in mind that some 75% of the pig leg is coveredd with skin as opposed to the completely uncovered venison haunch, it's not surprising that you'd end up with a very salty ham. You can dry cure a ham with far far less salt then you would expect, I have a 3 year old pig ham that I cured with approx 1 tablespoon of salt, a lot less than I usually use but I was copying an old method I'd read about, it aged beautifully over 3 years and tastes fantastic, I wouldn't suggest going down that route for a first attempt, but as an experiment, and for my own consumption only, I was happy to give it a go. Personally I think that using a cure which is a mix of a reasonable amount of salt, cure#2 and your own herbs and spices is the best way to go. I'm pretty new to curing venison haunches so I don't have any definate ratios or timings yet but It's certainly interesting working it out.