I think so.. I've always had the most luck right after an inspection.. an example.. on my glaive today...
Can't wait to use this baby in 1 1/2 more lvls.. 72+5 c12.. i was very scared to try to change the phys because of the crit being 12.. but i held my breath and did a 10% stone.. fail.. then i just had a feeling, so i went with it with a 20% stone... boom [ 25% -> 41% ] and it upped my Attk rating too.. yay