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Once the compression and rpm got kind of on the ragged edge I switched too Castrol A747 and I must say that it is without a doubt the finest oil I ever ran. I don't even know if it can still be had but 15 or however many years ago I ran it I had too order it from europe and it was SPENDY.
Yep, A747 is still available, but has been superseded by XR77 as Castrol's premier 2 stroke lube.
Elf HTX909 and HTX979, Maxima 927, Motul 800 2T R & OR and Kart 2T, Silkolene Pro 2, Pro 2 SX and Pro KR2, Agip Racing 2T, even Mobil 1 Racing 2T (we can still buy that here) are all premium 2 stroke race oils that I'd have no hesitation in running. I've settled on Motul 800 2T Off Road as it's the closest decent oil I can get my grubby little hands on. I'm sure Motul 710 or even 510 or Castrol Power 1 Racing TTS would be fine too, but fuel mix is cheap to me in the scheme of things.
Like most boards certain brands/makes/people gain cult status for various reasons and Klotz R50 has become one of them, much like Stihl HP Ultra was/is for a fair while, but there's more than just one oil that works well in a saw.
Unless you are running an awfully fast hot saw no one here would have an engine approaching the specific output of a 100cc international kart engine that revs to 22,000RPM, or a 250cc GP road bike which is what those oils are designed for.