CRS hit on something that is very important to rod sensitivity - guide material selection, wrap, epoxy and spacing. Full line contact but at the lightest weight possible.
I have been a single-foot Fuji Alconite fan. SIC rings are too brittle, so I stopped using them. I would reduce down to a fly guide as quickly as possible, and it made a huge difference.
Now, there are a number of wire guides that have no ceramic insert that hold up well against braid. I bought a set from Mudhole to try, and it almost feels like the blank has no guides yet. Very impressive. And after a summer of fishing, not even a blemish on them despite lots of drag-pulling. I'm very impressed with these guides.
I'm strongly considering swapping to these guides next time I need to refurbish one of my older MB builds.