re: Holesawing with ease and without the tears.

I recognize this article and have corresponded with kiefer (pine in english) about it. The actual problem here is that these drills are not designed for use in wood, but metal. The best solution is therefore to use drills suitable for wood such as e.g. this one.

I know that the one you use are sold as being suitable for wood, but they are not designed for it. They simply have too many teeth. 
And yes I know that there are more people who use this drill bit in wood than the ones that use a wood drill bit.