You went from a 2.5 mV HO MC cart to a 0.6 mV output low/med output MC cart. According to the KAB gain calculator, your new cart needs 13 dB more gain than the old, so I don't think that the BAT is going to solve the problem. The hiss you are hearing is probably a combination of overload and tube noise from goosing the volume up so high, which, IMO is likely the result of trying to drive low efficiency monitors (published spec I find is actually 85 dB w a nominal impedance of 6 ohms) w tubes. In most cases tube amps will make less power into a lower impedance load. W/O seeing the impedance curve of the speaker, or knowing your room size, it's hard to be more specific.
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