My rate for each of my team members is 200+ per hour depending on what package they purchase (more hours = slightly lower rate, less hours, higher rate). We target corporate clients. Just it's been going so fast and been so stressful, it's not about the money. We've gone from 2 founders to 10+ employees very quickly.

Then it could be $250 or $300/h, and you could drop a client.

And keep in mind, you'll want to be giving your employees a pay raise as well. They'll know what the clients are paying. Not a 1-to-1 increase, but maybe 30%. Make sure they realize you value their work.

Another option is to reduce the workhours from 80hr/week to 40hr/week.

$300 isn't unreasonable, there is a small dev shop in town with a proprietary CMS that charges $315 for creative/development work; and they're one of the most successful around town.