Zedelex,
Something that could be interesting to your route comes to my mind.
If you have an access to ATR FCOMs, particularly the performance part, have a look a the climb section.
You ll find out that an ATR is quite limited in CRZ level.
It has to achieve 300 ft/min for operational ceiling.
On hot days, ISA+10 and max weight, you only can achieve FL210 or so.
Regards.