The PDCS might suffer from at least two problems. First, the engine and flight model may not represent the real plane. While this is true for most sim renditions, the margin between real and sim is the important one. If you look into the forums, you will sense that the current build offers a very powerful plane, so you might receive a more or less wrong performance when trying to fly real world EPR values.

The PDCS itself does compute values (can't say how much offset they have), but those would then get merged with the mentioned engine and flight model. Adding to that, the current PDCS gauge seems like a potential source of CTDs, as CXA mentioned. We couldn't really narrow it down to a certain function though, unfortunately.

The solution in regard to matching rw performance could be to develop a performance table which takes all those sim factors into account and then gives you some EPR values (for example, via patched gauges) to follow. The better solution would be to harmonize the performance elements which, for some users, would reduce the fun as we would surely receive a less powerful plane.

I would opt for the latter, but I'm not sure if all users would agree and, therefore, if the extra work would be justified. If you've already experienced the 727 and 707, you may agree that the flair and atmosphere are great but the 'close to rw' performance sometimes only matches ballpark figures.