I have never been a great fan of prizes with temp mods.
Killing 150+10 bosses is a big effort for a mod that lasts only a week.
On top of that due to the crash in the beginning of january all temp mods of the last couple of weeks have been useless because there have been no events where they could have been used.
Climax was the recent EB wrapper with a temp mod that ended before it could be earned!
So I suggest that you no longer give away temp mods at all. I prefer an unlimited 1 or 2% mod over a 5 or 10% temp mod.