A personal suggestion(which I already commented on the Cavalry tactics thread):
Change Knightly Order basic knights into: same stats, lance, single pistol, plate armour( bulletproof cuirass, if you want). Something along the lines of 19 points. Now we have cheaper, faster and better on their role 'Nilla knights, trading resilience for versatility.
Knightly Order become the current IC knights. The special choice reflects their rarity( I know in Empire fluff Knightly orders are all around the place, but I find quite unreallistic that full armies can be made of full white harness, créme-de-la-créme gendarmes equivalents.
25 points, 1+ save, strength 4. One or two more magic banners for them. Being special choices, maybe even some kind of "Order specific upgrade" could work. Nothing overly complicated, as "Reroll rallying tests", or "-1 to hit when being stand and shooted".
I think with this changes basic Knights, IC knights and Pistoliers would be different enough to not overlap.