Problems simulating the LTC-7060 Low Side Waveform

I am simulating an inverter modeled after the first typical application on the datasheet. It has a supply voltage of 48V, a VCC of 10V, and a PWM of 300kHz (0-3.3V). My problem is that I cannot get the low side gates to go past ~11V. When I take out the ground under the lowside mosfets and put a virtual ground of -38V, lowside square wave has the desired amplitude but is offset by -16V. Could some one help me get the wave to be 48V to -48V?

Thank you for the help!


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