I also have tested the IS-60 and L12s with the A12x25 fan, here it is added on the list below:
IS-60 (stock fan, blowing down) - 1520 rpm @ 60.7C delta
IS-60 (A12x15, blowing down) - 1717 rpm @ 59.5C delta
IS-60 (A12x25, blowing down) - 2027 rpm @ 56.7C delta
L12S (stock fan, below cooler...