You did pick up 8 fps on the 475 arrow.
When I was quoting a 9fps gain, it was with a 29vs30" draw and shooting a 438 grain arrow.

My new Mighty mite#' s (just for redundancy sake)
29.5" draw, 65# pull 426 grain completed arrow - 28.75" beman ics340 **
272 average for 70ft/lbs ke!!

My previous speed was 266 with a 438-grain arrow. My increase was due to moving the string leech closer to the lower cam and keeping it there with a small nock placed just above it, and slightly reducing arrow weight.

I' m sure happy with the numbers for only pulling 65#, with my recent 4 wheeler wreck induced hurting shoulders/chest I doubt I could pull much more!!

**going to duravanes from bohnings dropped my arrow weight by 12 grains, this includes a cleaner fletching job then what they came with (messy[X(], excessive glue)