RE: Putting an NP Excess 6.9 on a Kombat 97?
Agree with Ola. A Saber will be more powerfull than an Excess than an Expression :
The Saber is more deeply drafted and has more foot area than either the Excess or Expression. Therefore, a Saber 6.7 might be as powerfull as a 6.9 Excess or a 6.9 Expression.
It also depends a lot on what program do you want to focus on (speed versus manoeuvrability) :