Guild Wars 2

Hi! So basically I’ve been doing Tequatl about 2 times a day for the past 3 weeks. I mostly did it on my level 50 guardian(now she’s lvl 69) because I found it easy to level up my character this way without grinding for the entire day. My problem is, that even though I’m one of the few people who doesn’t die at all(and even if, it’s rare), heals, buffs and revives allies and deals a fair amount of damage to Tequatl(since I use lvl 50 gear I usually hit him with fiery greatswords and icebows) I only usually get 1 chest, the exotic one. I do participate in all of the defense events, but it still doesn’t seem to count at all. I usually manage to get all of the remaining chests with my 2nd or 3rd try that day.
I’m not sure if it’s a bug, or if that battle is designed so only the damage dealt counts(I obviously have no fiery greatswords nor icebows while defending the batterries) but I don’t think it’s a fair way of doing things at all. I thought anet wants us to use different builds, but based on that Tequatl event it seems to me like dps is all that matters. I basically get punished for healing my teammates, I mean I clearly don’t deal enough damage on the defense event, right? Or maybe it is a bug, I don’t know. I’m only sure I deal enough damage to Teq himself to get my rewards.
If anyone could explain me how this works, it would be great.

Also it’s worth mentioning, that once I did my best to win and I didn’t get ANYTHING AT ALL. It didn’t event count as me doing the event, and I’m sure I did all I could.

I have read in other threads that this is a problem. At least you have help when you get to him. I have tried multiple times and I am the only one there. Yeah not about to try and kill a big lizard by my lonesome