3KW SR motor gate driver and simulation questions
The problem you have is the high side driver is a boot-strap type of circuit which relies on the lower switch of a leg pulling LOW to facilitate charging the capacitor for the higher driver. You have an Asymmetric H-Bridge for an SR machine and thus do not have a complete inverter leg. 

The voltage swing of the SOURCE of the upper device is not enough to facilitate providing enough charge. 

Such boot-strap circuits work for leg's of inverters as the SOURCE will be pulled down to 0V

For now replace the driver with individual floating drivers