Jeff, i have only made a few for that model, and was told by Excalibur that all Matrix Strings are made to the same length. After i take the tension off mine they measure 31" after relaxing overnight. This works well for my two bows, and no complaints from any Matrix owners I make strings for. As for the tag ends, I go 16 twists after forming my loops, then snip the tags when the string is stretched.
Matrix 355 (Trixxi) Redfield Revenge 2.5 Trigger Tech
Matrix 330 (Xylia) Nikon Bolt XR Single Stage Trigger Tech
Kodabow Zulu Scout (Karma) MFO Tagged Out Sights.
Hoyt Spyder 34 (Black Magic)