A couple of points relating to earlier comments:
The 'evidence' supported the introduction of 5/2/5/4. Fatigue data from home and overseas was used, plus the trial period data.
Quite often, under the previous 6/3, there were only 2 days off anyway between roster periods...........no great change there then, except now it's only 5 days till a break.
The implementation has been seriously under-crewed and poorly managed leading to continual changing of the agreed pattern, thus nullifying all the reasons for it's introduction.
If EZ have approached the CAA for an increase to the 900 hrs limit, they've done it very quietly without a mention to Balpa (or anyone else it seems!).
Bottom line, crew it properly, run it properly, don't change patterns and then we'll have the absolute definitive answer.
Personally, 5/3/5/4 would work a dream and give max delivery without aggro.