Hi Llanfihangel,
I can't help you directly but since your post has yet to receive a response, I'm replying in order to bump it back up onto the home page. That will give it another chance to be noticed, hopefully by someone able to answer your questions.
In the meantime, I have a few suggestions:
> You could ask the Mods to move your post to Rootschat's Wales Board. (I should think one of your compatriots is more likely to be able to answer your questions.) To contact the Mods, I think you need to click on "Report to moderator" at the bottom of your post, on the right-hand side.
> A shorter, snappier title for your post might grab more attention. Perhaps something like: "Welsh Wills at NLW - the Bounders!" (From what you say, the word "Bounder" has a different meaning in the context of Welsh Wills; but it's widely understood to mean "dishonourable person". So the heading I've suggested might be more noticeable.) The Mods would, I imagine, be able to alter the title for you.
> Have you tried emailing your questions to NLW?
> What about Archives Wales?
> What about a local FHS? Genuki lists Welsh FHS at:
https://www.genuki.org.uk/Societies/Wales> What about a History Society? (Local history rather than family history.)
> What about the History Department of a Welsh university?
The answers you need must be out there somewhere and I do hope you find them soon.
Best of luck!
theirchild