Troubles raising my 4yo boy with hearing difficulties

Hey guys, I have a 4yo son who is in his first term at Primary School. At birth they told us he has hearing difficulties, not deaf but not 100%. Over the next several years he was tested every 9 months or so, his hearing didnt get any better or worse. My little man cant hear about the bottom 15% of the human audible range, which is essentially a whisper or a regular voice in a loud room. One on One hes brilliant, he can hear (and lip read) effectively enough that you would never know. But when its noisy he can make out what your saying.About 6 months before moving from nursery to Primary school he was fitted with hearing aids, these helped loads when he was in a busy room with lots going on as that was his main issue. In a busy room he couldn't pick out your voice, but now with his hearing aids he can. We have had his development come along in leaps and bounds since he started with his "Iron Man ears" (his name for them).He started Primary School in September and since then he is reading basic words and writing letters, me and my wife are so chuffed. BUT.... here comes the problems.My parents were Olympic level Judo practitioners when they met, ive been doing martial arts since I was little and do BJJ regularly. I love play fighting with him and he loves it too as do his cousins. But now hes in school hes started lashing out and when he lashes out because he is used to fighting with me and his older cousins hes rather adept at it.I have been told by my wife a few times that hes been told off a few times for fighting but I had no idea until I sat down with his teacher the other day. Essentially he his watched constantly at break time by a teacher to stop him from hurting kids, which makes me sad :(He doesn't like his hearing aids being touched as it produces a massive feedback spike in his ear. He will lash out at kids and grownups alike if any one comes any where near his ears. If its too noisy he will lash out. He once while walking with a teacher changed direction walked up to a kid 2 years older and punched him straight in the face and knocked him over because he was mean to his cousin a few days ago. His teacher told me he once walked up to a kid who had fallen over and kicked him. They are pulling their hair out trying to figure out why. As when asked he is always honest about it but cant express why he did it.As a result both my and my sister in law have reluctantly put an end to play fighting at home for a while to see how it goes. But without taking his hearing aids off I dont know what else I can do to curtail his violent issues.Any advice from parents with hearing impaired children would be greatly appreciated. via /r/Parenting http://ift.tt/2h2IKIN