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Your roo is too "hardcore" to be ever cured. The problem here has two causes, if he is a RIR, chances are he came from production bred lines. They are bred for production.. not personality. Possibly for some production strains, the higher aggression in roosters is linked to higher production in hens, or due to being selected for high production with almost every other trait being ignored/not considered important, a gene for aggression happens to be in there and so gets selected for by accident. Second cause is being raised very tame.. disaster if combined with a rooster with genetic inclination to be aggressive.
A lot of people have trouble accepting that aggression has a genetic basis. Also, it exists in a continuum, from very low aggression towards extreme aggression. Many roosters are somewhere in middle.. basically a rooster with enough aggression to maybe go after people(especially if hand raised very closely/tame).. but potentially also easily discouraged by ANY deterrent methods. This why some people will say "I did this and it worked for me" while another person report that method not working at all.. with the rooster keep coming back to attack again.
Your rooster throwing himself against fence and biting while being held is showing aggression on very high end of the spectrum.. this rooster is going to attack people again, pretty much no matter what you do. He's just too aggressive by genetic reasons plus being raised very tame..
High aggression is pretty common in production bred RIR. If you look around, RIR roosters seem to come out on the top of the most aggressive breed.
Now you will see someone saying THEIR RIR is sweet or not mean at all.. realize it is STRAIN.. a bloodline, so to speak.. it's not RIR in general.
