Perhaps the new Uber could be something along the lines of a physical boost for the player being healed and afterwards for a short while.

Maybe make it so the max health of the target being healed is increased based on how long you've been healing them for an extra 100-200 hit points at the longest amount of time on them.

From this afterwards once disconnected the players max health would drop back to its normal amount over double the amount of time it would have taken to give them the extra health.

With this Uber over heal would be reduced by half or more for obvious reasons and possibly have a longer Uber charge rate, from this due to the effects of this Uber it would take about 10 seconds for the charge to be used completely making for a total of 20 seconds of extra health after disconnecting.

Whilst true this would mean that for as long as your connected either it be even 1 second you would have double the time until the effect lost effect completely.

This however would have a dangerous side effect as if the effected's health drops below its natural lowest level when the max health drops it could kill the person effected if they are unable to heal for any reason.

To make certain this Isn't too overpowered feel free to respond and share your ideas on how to balance this, and this is based on the idea anyone here actually likes this idea.

Thanks for taking the time to read over this, and please talk about this idea at mass to try and decide what would be best for the new type of Uber charge.