Righting Moment Calcs

[Stillbuilding]

I have had professional engineering calculations done on my proposed rig for a 65' long keeled steel cruising yacht.
The engineering was based on Righting Moment @ 25 degrees. The rigging is calculated with Nitronic rod and results in a mast 15.24" x 9.61" and wall thickness 0.28".

I was a little surprised to find the section no larger compared with some other yachts.
My background reading would suggest that traditional calculations have been done on RM @ 30 degrees.

Any comments or reservations about this? My guess is that it is a calculation which places greater reliance on the rigging strength than was traditionally the case. Is this a smart direction to be heading in? Most particularly does this produce a mast specification which may be on the light side for a cruising yacht?

Gratuitous comments welcome.
Thanks