No worries at all mate, busy end of the year!
Thanks for the reply all the same, great to bounce ideas off someone else. After a little more research, I think I'll opt for a front/rear split as opposed to a diagonal split, and either a factory prop valve, or an adjustable type like you've mentioned. Thanks for the above link also, I'll look into it. First step for the new year is to finally build a rotisserie to make brake line fabrication as well as a myriad of other under-car SLJ's that much easier.
Mike.