I used PocketHackMaster to move my 400 to 497.5 and it worked well. PHM has many more things you can adjust, and consequently many more ways to lock up the Ax pretty hard, so it's not for the faint of heart. However, for those who want to try, my Ax 400 moved to 497.5 with settings of 27, 2, 2.5 (You have to get the product to understand the settings, or read the thread at Brighthand.com that is now over 170 pages long.)
Pockethackmaster.com
is the web site, but there is more on Brighthand.com.