Can Fischer Random Chess, be better than Regular Chess in Correspondence??
If Yes then Why?... [b]and If No then Why?

Yes, because it's more about skill and creativity, rather than memorized patterns. I think others would disagree, simply because they've put so much study into studying chess based on the conventional set-up.

960 can be fun, sure. I have played it on other corr sites that fully support it. I'm not sure if they ever fixed it to allow castling here.

I Agree, but it would let you place pieces so your first move could be castling!