I think I am TF as in I haven't used chem's in 5 years. I do however do splits to reduce mite load and breed from my best survivors queen. I only kill queens if they become drone layers or start having a poor brood pattern and if she real mean. I use the alcohol wash method to determine mite load. I also try not to mix broods from different hives in order to keep the mite gene pool shallow. I am just curious where the line is on TF and IPM.