Hind sight

Just thinking and looking for experienced answers.

I have 10 tanks. 1 new Omega & Fd tanks (30 & 45 min) and an AV compressor. Everything is good but, to do over?

Now is the question; anyone have a 6000psi nitrogen (big) bottle? Do you fill your "to go" tanks from it. Is it cost effective. It is clean and dry. What fill adapters would you need. Please educate me (us).