Hello Agressive,
First of all thank you for your time reporting these players.
Secondly my opinion about these kind of situations is following: Both CTs should be CT banned, since they knew rules but broke them intentionally (they knew how to enable ffa so they must have read the rules - 100% sure about it). For destroying the gaming atmosphere I would suggest 1 week ban for both players so they can see that breaking rules cannot go unpunished.
Finally, for the 600 minutes: They will not be back, it was discussed on the meeting, CT time is reduced to 180 minutes and will stay like that.
I hope that my opinion was fair enough for everyone on this case.
@Buck it is your judgement and I hope my reply was useful.
Cheers,
Popay