For 4 man dungeons I generally make use of my cards as I get them, RRing spear or arrow when I get them and they won't be of significant use to a party member, and using the extended RR on a balance or bole - rarely I'll use it on an ever if I or the tank really needs it.
I never burn ewer or spire for RR in light parties, the overall effect, imho, isn't worth the reduced potency. I either redraw if I don't need it or pop it on someone who does.
Sometimes, if the tank isn't taking much damage, I burn bole so I can fish for a more powerful balance, or bole if I expect the tank to be taking damage soon. Enhanced ewer or spire is usually a waste, though enhanced arrow on a BLM is incredible.

In 8 mans, in contrast, I almost always try to get an ewer or spire to burn for expanded. Expanded bole on a full party is very very satosfying, and expanded bole can be useful for aoe damage going out, like odin's bleeding spears. I almost never use expanded spear or arrow in 8 mans.