Sorry - but it still sound like slave labour. Or labor. I wonder whether the CAA knew that 'when you time out for JAA, you can still teach FAA' was a culture which applied at your organisation when they considered your approval to conduct JAA training in a non-member state?
Working flat out at the rate you suggest - not just the flight instruction time - for 6 days every week is NOT something that anyone should be proud of.
100 hours in 28 days is around 3.6 hours per day. If an FI (by the way, 'Q'FI is NOT a JAR term, it is a UK military term), gives a 20 min pre-flight brief, 10 minutes to get the ac started, an hour in the air, 10 minutes to walk in and 20 min for the debrief, that's 2 hours instruction time per student. So if you start at 0800, and do that pattern twice, then have an hour's break from 1200-1300, you can then do the same thing in the afternoon, finishing at 1700, until you reach your 100 hours in 28 days (that's consecutive, not 'working days', by the way). Then you stop until you are allowed to teach under JAR rules again.
But if you're encouraging people to work long hours in excess of the JAR rules, then it's hardly surprising that your pirices are lower than prices in the UK......
I will draw the attention of a CAA colleague to this thread.