I also don't typically Spread buffs in 4man content, at least I don't plan to. But my overall thought process is to put out as many useful buffs as possible, so if the stars line up then I won't hang onto a buff for very long in the hopes of making it extended or enhanced when Spread is available. The sooner you use it the sooner you get another to use and the more support you've offered to the party overall.

I pretty much never use a card on myself unless I've died recently or messed up my MP management. Even multiple raises don't usually warrant it.