I think that this is one of the things that frustrates me the most about curing... I tend towards the black and white and much of curing is grey area. So much depends on factors both outside of your control and unknown by you and all you can do is go with historical reference and cross your fingers knowing that in the end you might have some failures.
Thanks guys. I'm going to go for the time you suggested and will post an update post smoke. I'm also interested in how the phosphate is going to help with moisture retention. Previously I've been losing about 13-15% of weight... I'll weigh post-cure/pre-smoke and then again post-smoke/post-rest.