1) Because I lost my turret rig in an HD crash months ago and have been too lazy to deal with it till now. So I'll get to them eventually.
2) They do use their ions, arrays that is. The effective range of usn ion arrays is less than their imperial counterparts, you just have to move the ships in-range.
Same goes for spinal guns (plasma beams), you have to move your ships in-range to use them (which I think is 10km or so). Ships like frigates tend to be unable to fire there's often because (when engaging other frigates), their targets move out of th firing arc of the main gun (which is a cone of only 10 degrees).
Try manually moving your big ships around to see what a difference range makes. (50km + is torp range, 20-30km is rail-cannon range, 15km and closer = ion array + plasma cannon range).