We, as well as our partners, have made a lot of such boards, in this mode, the boards work in light mode, this extends the life of the ASIC device.
+1
The control board has enough resources to handle additional boards. The problem can only be in the electrical load of the interface. The total stray capacitance/inductance can be an invisible problem. Resistors suppress transient, but do not solve the gain problem.
Remember to carefully remove the flux from the solder points. The transient oscillation is already characteristic of these wires, but an active flux can take away a significant part of the hashrate.