I have that combination of (1 year old) Buddha Phoenix Flash and new TrueIDE, but I tested it in a basic A4000. I could not get either of my 2 the TrueIDE to work straight off the A4000's own (working) IDE, but it worked well on the Buddha; this tells me that the TrueIDE is not a panacea for IDE to CF cards -- it has "issues." The A4000's IDE port is old, basic and slow.
My Buddha(s) work, but to report in the early start menu that they are working only means that a query of the ROM and electronics returns a "working" response. I have had other cards that reported this when they were otherwise non-functional.
Ergo, if you can't get the Buddha to work with a known working IDE drive, then you might have a problem there.