I do turn a lot of it and fast speed clearing and also squirting water in the hole helps to keep the heat down. I always use water with all of the dymond woods and acrylics and havn't had problems sense I started. With acrylics I drop the speed down though to the lowest that it will go and use water, filling the hole every time that I clear the bit.
Also at the suggestion of a pen turner that has much more experence than I, I bought a 29 piece set of Dewalt pilot point bits and can't believe the difference, they are great. Our Home Depot has them now for about fifty five dollars for a twenty nine bit set. I happened to get mine on ebay for less but had some trouble, had to return the first set but they have been worth all of the messing around and then some.
Wayne