Since they're both Easton arrows, and from what I can see, very close in spine/weight (inserts weigh a few grain different), I would suspect bow/rest tuning issues over arrow spine throwing it off.......especially 3" at only 10yds.
Is fletching the same and/or same position? Maybe some vanes contact on the new ones?
(also assuming we're talking field points of same size and don't have a insert alignment problem)
2009 Martin Bengal M2 Pro Cam w/factory STS & CCS.....66lbs, 29" DL, 422gr @ 272fps, Winners Choice string/cable, Trophy Taker drop-away Rest, Scott Release
1996 Martin Firecat XRG Pro Series w/Ultra Sonic wheels.....69lbs, 29" DL, 465gr @ 245fps, w/fingers & Martin leather glove