How to decrease Rwp in Powder solve in crystal str. solution of organic molecule?

Wat is the fast method of reducing the Rwp in powder solve. In my case I have got a udf file of a crystal and Rwp obtained after str soln. is 91.92 which is too large. It is mentioned to increase the no. of steps per cycle or no. of cycles to decrease its value but already computation time is too large and steps I have mentioned are 5000000 and no. of cycles are 10. So wat is the easiest method to reduce its value. I have followed the tutorial of reflex plus mentioned under MS.

Regards

Janhvi