Erm, I believe the default setback on both these boards is about half of what you guys are describing. 1.5" would be pretty much powder board territory.
Also, he cannot go smaller on the Premier F1 - in fact, NS even discontinued the 157 size...
I never told him to go smaller, just said that's a large board for his weight. Also I'm 99% positive my factory setback is between 1-1.5" on my heritage.