The way I see it storage charge is over rated. In my opinion storing Lipos for a long time risks damaging them. It takes a long time for a Lipo to self discharge. If you race frequently you can keep them stored with lower voltage. Storing them fully charged or with to much charge is bad. After your last run of the day if they are at 3.5 to 3.85v per cell and you race every week or couple of weeks you can leave them like this. If you plan to store them for a very long time you should cycle them every 8-10 weeks to be safe.