Caster question

Depends on how you lower it, and where the UCAs were before the lowering.
But probably the caster would increase, If the UCA moves rearward carrying the UBJ with it then the caster will increase. The position of the UBJ, relative to the LBJ, determines the caster.
If the strut rod is parallel to the ground when you start, then any ride height change, will pull the LCA forward, increasing the caster. If at the same time, the UCA is moving rearward, then caster is increasing;
but if the UCA is moving forward, then the caster is decreasing.
To understand this you must realize that the UCA pivots are NOT parallel to the roadway, so the UCA is ALWAYS moving forward or backward and carrying the UBJ with it, relative to the chassis.

But if the strutrods are not parallel to the roadway, oh my head is hurting again, then the LCA could also move backwards and forwards, throwing a whole nuther level of complication into the mix.

The bottom line is this; if you just have to lower the car, do it either with tire sizes or drop-spindles, and set the suspension up to somewhere close to the factory settings.
If you need more caster, install the MOOG Problem-Solver UCA bushings, but be prepared to spend some time on the alignment rack.