AnFI - 13 hours actually
I was taught to fly it by a very experienced mil instructor with thousands of hours R22 as well - all the safety issues were well known and discussed at length.
A year or so after I last flew a robbie (early 1990s), the most experienced R22 instructor in the UK (circa 8000 hrs on type IIRC) was killed in one due to a low G event and a MR strike on the tail - surmised to have been caused by a FW pilot entering auto by dumping the lever and pushing the nose forward!
Has anything I have said been untrue with regard to the PoF for mastbumping/ rotor strikes on the R22?
No - avoidance of mast bumping is what is taught on the Robinson safety course - so in trying to question my knowledge, you are encouraging less well-informed pilots to ignore the very real dangers of low G in Robinson helicopters.