What I see is that with the 3to1 ratio you are wanting speed of axis movement. If you went to 5to1 you would be in a much better suited power band and not need extra hoops to dance through. It would still provide a little more than 100 inches per speed and that is plenty. Also, you will find that especially when drilling with large bits, you will want the power in the feed rather than speed. All larger tooling will benefit from the power increase. I have found that even this is marginal at times !
Don
IH v-3 early model owner