4.5º - 5º IMO is not comfortable at all (it feels like playing with your right hand way out in front of you), and is really not necessary, you only have to see how high the tunomatic sits on a les paul. Yes I said above I tend to recess the bridge studs for that extra 1mm of adjustability, but I think it looks neater too. The reason (as I see it) for why Gibson have such a huge break angle, is because the fretboard sits directly onto the body, Fender, PRS etc have less angle because the fretboard sits slightly above the level of the body, reducing the need for the angle.
If you're using your angle-router-jig-thingy, you could start with a shallower angle, offer up a straight edge and the bridge and see how it looks, and go up slightly until you get an angle you're happy with.