Does centershot change with arrow selection?

Here's why I ask. Monday night I was shooting 250 CX Maximas from 15 to 30 yards using the same pin. Windage on the groups remained the same, but elevation dropped a bit going back. Groups were good for my skill level

Tonight, I was shooting 400 Lightspeeds and they fell left to right as I went from 15 to 30...elevation dropped similar to the CX arrows. Groups were inconsistent compared to the CXs.


Thanks for any advise

Chris
'07 Guardian 30" @ 62-63#
Trophy Taker FC
CX Maxima 362g w/100g tips 27" long
Easton Lightspeeds 347g w/100g tips 27" long