The only way i see that you will be able to ramp up the spindle to reduce amps would be to use g96 CSS at the time you index to a new tool (the index point on the LB15 the i program is maxed out in X)
limit the rpm to what you want to go G50S2000 and when you get to the point of starting say a drill turn it of g97 s2000 then drill your part
the dwell method only does a step up causing the motor to try and get to the correct rpm before moving to the next command ( should be smaller spikes in amps)
N2(DRILL)
G50S2000( when it gets to max rpm(2000 in this ex) going to 0.000 it will hold it at the programmed rate)
G0G95G96M3S350T0202M42M8
G0X0.Z.100
G97S2000