When I got my 2013 model (with a very high-compression head) it was a pig to start too. Some 10-15 kicks cold, 3-5 kicks warm and very hard to kick due to high compression head. I then used Castrol 2T oil back then
I then devised a 9V battery system to give initial boost to fuel pump, sparkplug and injector:
It was night/day difference then, some 1-3 kicks cold, 1-2 kicks warm.
In the end through practice I figured it's actually the most important to have the correct fuel/oil mixture, it must be a very precise 9% (1:110) and also keeping the magneto clean so it creates enough electricity during kicking. I clean the magneto every time I change the engine oil. Considering those two things and after using only GRO Offroad 2T oil, I actually haven't required the 9V start system anymore since I get about the SAME results with just dry kicking both cold/warm. For cold start I give first a soft kick, I then hear the fuel pump whine, pressurize the system and give some voltage to the capacitor charge, then usually just one sharp kick starts the bike. Warm start: 1 sometimes 2 sharp kicks and it's running (all this with no 9V support). I keep the 9V system just for backup now, haven't required this for ages now actually, might take it off for less bulk and complication.
In any case it's a stunning and mighty capable trials bike to ride. Everything is just put right with it's ride quality and handling. There's no replacement for a non-compromising design and a proper EFI, I'd ride no other compromised 2T or a carburated or a pig-heavy 4T trials bike if you ask me. OSSA just ticks all those boxes for me.