Hey Sephr.
We generally don't accept appeals for karma bans, regardless of whether or not the kills in question were valid. Karma is primarily used for us as an indicator of how aggressively you're playing rather than an automatic way of getting rid of someone RDMing.
In this case seeing people continue to enter the t room and repeatedly finding that they're innocent should be a sign that innocents are being let into the t room and you shouldn't indiscriminately blast everyone present. It's just a one hour time out to remind you to be slightly less trigger happy, so you'll have to sit it out.
And yes, we raised the karma threshold to 600 for everyone.
Feel free to DM me on here or on discord if you'd like to discuss this further.