Hi Steve ... No idea if they are a Mizuno AD?
Glad to hear you are getting on well with your recent purchases - Not surprised the Hzrdus RDX is a bit "meh" for you - Most of their range (for me) have been totally lacking in feel & feedback - I think they are better suited to the beasts who walk among us!
Back in the day, those old 1 & 2 irons of which you spoke, were handy if you lost your bread knife!
I don't like big putters either, but equally, I don't like big grips!
Good job there is no "one size fits all" when it comes to golf equipment ...
Cheers
PB