Actually you do want that dramatic of an increase per tier. Trust me I tested a lot of this stuff with the demo. An untrained stormtrooper shoots in a 60 degree cone, a basic in a 30 degree cone, a trained in a 15 degree cone, a highly trained at 7.5, an elite at 3.75, a heroic at 1.875, and a legendary at 1 degree. The same is true for times between bursts of fire, after firing a 100 bolts an untrained trooper will take a full minute to reload. This makes each level up about 2-4 times as effective as the level below. Build times are also dramatically different, untrained stormtroopers can be built in just a day. Basic take a full training cycle of 42 days (I think I'll make days shorter or something) while a Legendary formation takes almost 2 years to train.