Very true, I usually go for cheap PD weapons on small slot to saves those OP for main guns on capital ship.
But I do so on most ship, also to save flux, and I don't have the same feeling as this ship ( usually go for 2/4 system) not targeting, shield, more missiles, maneuvering jets and so on).
I think part of the explanation is coming from the fact that system cost more on bigger ship but since they don't go up between a 45Dp ship and this 100Dp ship...
The other ship I played with more than 100Dp was the one from occulian Armada and it felt bit less free on OP spending. Granted it had several modules and 2 of which had mounted weapons with built in hight flux forcing you to spend op on flux generation. Same with the moving orbital station ship, can't remember the mod, ship was powerful but more in line in terms of OP management ( was around 85dp). Both these ship had 4/5 modules and the op were split and for some system you had to spend 4/5 times the cost to have them on all parts of the ship.
When I get access to my computer, I will try to give a more detailed account of what I slapped there.
Again, very good work, I am just trying to help in my own way by giving infos to reflect on ( I will buger off now)