Hi rudderrudderrat,
thanks for the link to an interesting report. I think the following (from para. 1.10.4 of the report) is relevant to our discussion:
The relevant CAA recommendation was that PAPIs should be sited to give a wheel height over the landing threshold of 30 feet for the most demanding aircraft that used the aerodrome.
It would be of interest to know if that recommendation is still valid and also what practices apply in other parts of the world. Questions with regard to the OP:
a. How does the eye-to-wheel height of the OP's aircraft compare to the "most demanding aircraft that use(s) the aerodrome"?
b. Are pilots expected to make adjustment for their eye-to-wheel height when using PAPIs?