Am I doing the right thing or being to strict??

Hi
I have 2 teenage boys (14 & 16) and my 16 year old has an addiction to gaming on his laptop to the point where he was taking 1 shift off work a week cos he was to tired (from gaming all night). We let them have their own way with tech during the school holidays and they were on it from sun up till sun down. We have implemented them to having tech 3 days a week and to be off at 10.30pm now that school has started up again and depending on behaviour and attitude they may get time on it on the weekend. My 14 year old has mild autism and the 16 year has aspergers.
My 14 year old isn’t as bad and is ok with what has been put in place.
We also don’t allow them to have their mobile phones in their bedrooms of a night time either.
My 16 year old thinks it’s the worst thing in the world (to not even have his mobile in his room of a night time) and is threatening to leave home as he thinks we’re being to strict and that we should just let him ‘live his life’. He does use his phone for school, work, banking needs etc.
It’s starting to come between me and my partner as I’m not wanting the arguments about it with my 16 year old and can tend to give in to the ph being in his room.
My partner isn’t their biological dad but has been around since they were 5 & 3 (11 going on 12 years) and they want and have had nothing to do with their biological father after seeing him be abusive to me and his ex girlfriend.