So that looks to me to be confirming it's using tech crit for the DG Kinetic relic and force for the DG Elemental relic. I just did the same thing using the DG Kinetic relic although a shorter fight. My tech crit was 44.18%. The relic crit at 47.37%. Which is fine given the small sample size. http://www.torparse.com/a/59093
So it may look like this for which relic is using what for crit%
Just a theory me and my guildies been working on for a few days now.
BTW what is or was your crit rating at as this may effect the elemental and energy relics. I'm thinking base 5%+1% companion quests+5% from lucky shots and +X% from crit rating.