My wife and I also both have government jobs that offer a pension. The value is calculated similarly to your system. One thing I would do is to check online to see how well-run your state's pension system is in order to account for risk. You don't want to depend entirely on that money and then have it taken off the table 20 years from now. Our state is one of the top-five best funded in the country, so I'm fairly confident that it'll still be around when we need it.
We basically just save as much as we can and account for the pension funds as a bonus that we'll have later as well. Have you used cFIREsim? That allows you to figure in future income streams to check your FI status for various scenarios. For example, if we were considering retiring, say, three years from now, I would estimate what that would make my retirement payments be at age 60 when I'm able to start taking them, and then plug that in as a value that I'll start receiving in 2031 (we're a little older than you guys -- 46 and 42). I wouldn't look at it as an early retirement "penalty" necessarily if you don't go the full 30 years (or whatever your time period is). You're still getting something. Then if those numbers look really good, I might try it for two years with that retirement benefit, or five years -- whatever, you get the point.
Depending on what you spend, the pension can make a big difference in cutting years off your work life, even if you don't get the full benefit. Remember also that the calculations will change quickly if you get a couple of raises and bump the final average salary.
Finally, depending on how confident you are in the long-term solvency of your state's system, you might consider investing a little more aggressively, knowing that you have that money waiting. Some people will look at the pension in the same way as a bond fund when calculating their risk tolerance.
I don't know if any of that helps or not, but if you have any questions, let me know.