Your para 1 is correct as I said.
Re para 2: as I also said, you will be 1:30 into discretion. C/crew are normally 1 hour 'in hand' on flight deck - but you 'apparently' lose 30 minutes of that. That is assuming your roster says 'report 0600'. If it says, '06:30' then you are only 1 hour 'in'. If there is an unwritten rule that you report 30 mins early, get it in writing or get it reported, BUT remember most crew will get in ahead of report anyway as there is always not quite enough time.
As far as your last line goes, I'm sorry but that is plainly nonsense
this makes the difference between a legal or illegal day.
- the report is either 0600 or 0630. If it is 0630 and you arrive early that does not constitute an 'illegal day'. The whole system of Flt Time limitations is based on the report time declared by the company in the Ops manual. What is that in your case? Getting in 'early' does not legally eat into your available FDP.
Flight deck will normally always be further into discretion than cabin crew.
Lastly if the trips are REGULARLY operating into discretion, the ?CAA? will want to know and will ?hopefully? insist on a change of trip pattern. I believe the cut-off is around 30% going into discretion.