Ok Stu I'll go over this again.
off peak is now x/400 so anytime before 18:00 GMT there will be one arena.
you come online after that you will see 167/100 (it used to be /120).
I believe HTC did this so the second arena fills up faster, those people who disconnect or are just about to login will have to go into the second arena. When the second arena hits about 110/150 the first arena will go to 200. then so on etc
It is a better change IMO. We as a squad should either swap to the second arena by default. Usually that would depend on map preference and how many people have already been online fighting.
It is also clear to me that the cap is needed I don't think having TT every night would be that wonderful.