That is what I filter with. I dont think baking at 250 degrades the test, atleast I haven't been able to find any literature that dispels this. Usually I am just baking the oil to kill anything in it off then using warm oil to dilute the test/BA/BB mixture before filtering.
I don't think I missed on the calculation, I think I mis-measured the oil because I ended with 90ml of finished product when I usually am trying for 110ml(ish). Some is lost in transfering it from vessel to mixing jar and in filtering, but not 20ml of solution.