Cecco, do not fly high or low - on TCAS everyone can see that....
....will definitely elicit some chirping especially if rvsm. Offset to the right TOC to TOD and obviously not when routing dct (off an airway). 126.9 - as per the chart, and the JEPP text - Upper not Uniform, Golf not Green - keep a log as to: whom, where, what, going where - if you are below .79 best listen to whats behind you as well
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Climb as soon as you can - better up early than never. Be careful of large temperature variations over Northern Africa - have seen it go from ISA + 5 to ISA + 20 in a very short distance. Personally have never climbed or descended without a clearance - check your airway if you go from odd to even you better clb or descend. There was a midair between the USAAF and Luftwaffe like this a couple of years ago.. SSB My advise get on the owner or operators case and install one - hell a SATPHONE too - nice to have a plan B!!
Don`t be scared to ask for a relay or freq on 126.9 or even 121.5 - better to ask even silly questions than have an incident.
Storms in Africa are STORMS! not those piddly European things - go around them upwind if possible. When flying in cloud at below -40 deg watch the SAT carefully when near a storm, you could hit a warmer icing patch with the SAT down to - 35deg with supercooled water - exciting times!
Keep it up - cool to see someone doing their homework.