The extra precision will be the big difference maker from 85s to 97s and imo would be worth the purchase. The .5 meter increase shouldn't make you blink too much. As far as a ball combination, I'm beginning to think very Very strange things on that subject lol ;).
What do I mean? Well, I've been playing a lot of ReadyGo CTTH's lately, and virtually every single tournament a guy named Javiertorg is 1st place, or top 3. He plays with the Nike 100s with 4.5 spin and MaxMeterGoldVapor balls (2.5spin, 4.0dist, 5.0meter) which on paper have rather BLAH stats at a very expensive price.
I'm trying to wrap my head around how this guy can absolutely DOMINATE the other TLs like Fmagnets, Tasor, etc with a Crappy Ball (on paper!) So maybe some BALL GURU can step up and give some reasonable explanation? It's about the ugliest ball I've seen but if it really, somehow performs that well, then I might give it a try too (and I've been anti-slow meterish and more focused on spin to this point).