Puppy latched onto my arm and would not let go while growling, leaving deep marks

I have a 14 week old mixed breed (we think he’s a pit mixed with probably a million other things, he’s a rescue).

He is amazing and super super smart. He’s caught onto things super quick and is picking up commands great. Potty training has also been great.

However, he has HORRIBLE bite inhibition. I know this is normal but the typical things to curb it are just not working well. The only thing that somewhat makes a difference is removing myself from the room entirely but his latch is STRONG.

Tonight he bit me so hard on the arm to the point where I had to yell for my husband to come unlatch him from me. He was on there so tight that even going into his mouth to get my arm off was not working, we had to take him off of me pretty hard. Typically if it’s just my clothes I can unhook him, but the force was scary and he was snarling.

I’m huge on positive reinforcement for him, but in these moments my fight or flight is kicking in from the pain of his needle teeth.

I had just come home and I know he was excited to greet me but we inadvertently ended up yelling at him because it was scary. I also flinch and tense up when he bites like that because it genuinely hurts. I have two deep bite marks/gashes on my arm that bled pretty good and sting like hell now. He looked upset, so we gave him a “time out” and then once that was over he was immediately back to biting my arm.

I’m concerned about this behavior but even more worried that we’re messing up our bond with him by our knee jerk reactions. He bites me WAY more than my husband.