Ok this is solved. For those with the same issue, you need to insert a variable operate action that pulls the value you want your final double variable to be, associate that to a new string variable, then add another variable operate action with string to double (i.e. string to number) as processing way to save that string as the double variable.

Example: I want my double variable B to change at each loop. I create a string variable called REPEATS or whatever you want, then create a var operate action to associate the table with my B values to REPEATS. Then create a new var operate action with string to double as the processing way, choose the REPEATS string var from the drop down, then save to my B double var. Done.

Remember to set the two var operate actions out of the loop (not in a wordpress sense ).