I think you will be fine if you discharge through a 60a bms. If your running a single drive, you can set your vesc battery max at 60a and the bms and battery should handle it no problem.
A 60a Battery Supports bms is rated for 60a continuous current.
And if you set your vesc battery max at 60a, you theoretically should only pull that much at full throttle.
And, discharging through the bms gets you all of the protective features the bms has to offer.
And since your bms does not have a dedicated charge connection for the negative charger wire, Use the P- connection for the negative charge wire
And in case you didn’t know it, Battery Supports and Supower are the same.