Welcome to the wonderful world of variable rostering guys, in a previous Company I used to work that way all the time. At least now we know when our days off will be right through to next spring, in general, and why 5-2-5-4 suits me personally!!!
If only we could negotiate away the reserve period, if we had enough clout and enough crew to fly the programme properly!!
'Fingers' and 'dikes' ( no, not that sort Flaps One!!) springs to mind.
P.S. and yes you do have the legal numbers of days of in the short term on your roster.