i have never run a router, but ive run many machines of various rigidity over 40 years of machining, and this should apply.....run the cutter at or near recommended speeds, say 75% to start. run the cutter at or near recommended feed rate per tooth, say 75%. start with a very shallow depth of cut, say .005 inch. if you find success there, increase the depth parameter slowly, say 50% at a time. when you find you are breaking the points of the teeth, back off a little. you may need to spoil a few cutters to find optimal results, and of course if you really want to get the best cutting rates you can similarly play with the feed and speed rates youre using. imho, air is better than nothing, and mist is better than air. if you use nothing or air, you may want cutters with TiAlN coating, these are designed to run dry and hot. check your tool rep, there may be even better coatings available these days. oh and ive always preferred cutters with a small nose radius, but these will be more pricey and generate more pressure. but in a word or two, you will need to experiment a lil for your best results. good luck!