Given that your company wants to lay off 41 pilots for 4 airplanes suggests that with a complement of 365 pilots you have around 35 / 36 airplanes in total: 10.25 per frame including, I guess, managers.
For the 6 months low season between October and April you have 5 x 31 day months and 1 x 30 day month, total of 185 working days.
That equates to 185 x 365 working pilot days without redundancies, or 67525 days in total.
What the company is telling you is that they only have work for 324 x 185 pilot working days, 59940 days.
If you divide those available days between the original 365 you get 164 days, or a 12% reduction.
But the company still has the social fund bills to pay for 365 pilots, so you offer a 25% pay reduction across the board for a 75% roster.
Simple solution is that everyone, instead of working a 28 paid cycle, works 21 days on duty and takes 7 unpaid days per cycle.
The company saves on recruitment, retraining, retains experience and if the market conditions pick up over the winter and they need extra crews they are available instantly simply by increasing the rostered work patterns as no one goes out of currency. In addition, your sickness cover is enormous for the worst part of the year.
The pilots all keep a job, albeit at 75% salary, but have more time off.