Saving them until off-season Stage #7 is a great way to go. Not only will you have your entire pool of points (you never lose any, unless you advance to Stage #8, which is the draft), but you also will know the most recent storylines, see what Free Agents you were able to get (you can look at your Roster to see whether they signed if you weren't notified yet) and know exactly which picks your team has. Rarely I will scout in the first few weeks of the season if I know I need a certain position filled (or if I'm being impatient). So, whatever works best for you.