Yes, there is. Remember that any items sharing the same RWG value go into the same pool for randomization. Checking your input file, see that you have a "1" assigned to all of your trials across all of your blocks? Try, instead, using the same value only within blocks. So, e.g., try using an RWG value of "2" in your second block, "3" in your third block and so on. Let me know if that helps!

-Blair