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It deffinitely sounds complicated.
If the engine has too high of a compression ratio, the propane will burn up too soon, cause knock and lower efficiency. This also could happen with too much boost for the propane. It seems like there should be a cut off pressure and above that propane should be shut off.
If too little propane is use, well, no real effect. If too much, it could make everything too rich if mixed with too much diesel. There are likely operating conditions that benefit from very little propane, and others that need a lot more, and other in which there is no benefit and maybe even a disadvantage.
Then add ambient temperature and humidity to the mix of variables. Oh, and the nut behind the wheel variable.
I'm not saying don't try it. And it could be easy or could be a nightmare. You never know unless you try it.
P.S. Adding water injection along with propane should lower the chances of detonation.
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