well, I can see how you'de want a higher speed for the smaller bits, but, why slower for the larger? if you spin the bit faster, you are taking away less material per rotation than if you were going slower (maching brass, I jack the speeds up and move at a medium speed... and it leaves a very nice finish) , so does it matter? if it does, let me know!!
but then again, I do have that 1 HP bridgeport...
