To lose soft switching in the diodes, you would need to have significant secondary side leakage inductance, so that one diode was still conducting as the other one is about to turn on, due to transformer drive, even in this case the applied PIV of the diodes is limited by the o/p cap and the fact that the other diode is on, so there will not be large voltage spiking on the diodes unless the layout is very loose.
Regarding the output current, given that you are driving an LED string, you may not need to reduce the o/p volts by much in order for the current to reduce greatly, LLC is a good choice where the o/p volt range is 2:1 max, i.e. 100V down to 50V in your case, this should be enough to reduce the current in an LED string to low levels, easily tested with a varaible power supply, Regards, Orson Cart.