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Marc, I thought from the distances you quoted for the FF that you must be using one of the TS optiks units (sold also as APM). I have had one for about 18 months and it does a very good job of getting the field flat as can be seen by your third pic. Love the amount of play you get with distance to the chip as well. I have found that mine works anywhere between 105 - 110mm on my FLT98CF with no real observable difference anywhere within that range. It worked best at 103 - 105mm on my 80mm (600mm) F6 apo though.
Mark
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