AJP I see your posting is old but here goes: if your rod is a 7 to12 wt. some rod builders will put single foot ceramic guides on the rod- I often do. They will allow an easier shoot if slightly oversize. Not even? Guide (not eyes) spacing changes ,generally getting closer together towards the tip. If they're not straight they need to be re-wrapped. Hope this helps.
Fly rod guides
Threaded Mode