I too have had some frame experiences that were initially upsetting, but which I now see as having been inevitable. Wanting to try low-trail geometry, I tried to find a frame expert who would add rake to an existing 531 fork. I spoke to two KOF builders. Both tried to talk me out of the job, explaining the technical difficulties and attendant risks. One refused the job outright, and the other would "do as the customer requested," but was clearly not on-board. I've decided to satisfy my curiosity another way.
I really didn't want to look to other builders, and I didn't want to do a frame modification with a builder who did not think I was doing the right thing.
I'm very glad they were honest.
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Ken Freeman
Ann Arbor, MI USA