One suggestion would be to add some functionality to diagnostic scan. Maybe a toggle that switches between:
1. Diagnostic Scan doubles the tick rate of all HoTs on current target for the duration of the channel.
2. Diagnostic Scan increases the critical rating of the current target by X percent for the duration of the channel.
3. Diagnostic Scan increases the absorb rating of the current target by X percent for the duration of the cannel.
Basically you can choose between healing throughput, offense, or defense.