Increase max holdable charge for Spellthief's and Relic Shield Upgrades

Right now both of these items' income falls off sharply after the laning phase, largely because Supports sit on max charges and waste them. What if the more advanced versions held more charges? Say, instead of maxing out at 4 charges for Relic Shield line, it'd be 7, which works out to be exactly 1 wave w/ cannon. Something similar could be done for Spellthief's line. Instead of having 3 charges every 30 seconds, it'd be 6 charges every 1 minute (essentially you generate charges the same rate but can hold on to twice as much).