Just a couple of notes:
If your AGI is under 180K, make sure the first $4000 of tuition comes out of your pocket, not the 529 plans. Makes you eligible for the American Opportunity Tax Credit.
I note you are in PA. You can get a PA state tax break each year by contributing up to $14K per kid into a 529 plan. Doesn't matter if it is a PA 529 OR Utah 529. No minimum time it needs to be in the account, so you can be "washing" money through for the 3%.
I've two boys, one in the first year at Penn State, #2 starts this coming Fall. I pay the first $4000, rest comes from 529. 529s will run out sometime in year 3, Next step will be Series EE and I savings bonds cashed to get interest free by putting into 529s as needed (though must engineer income under I think $110K at that time, but shouldn't be a problem as retired for 17 years now, maybe quit my part-time work). Did not fully fund 529 for 4 year private as life's unpredictable, kids could change mind, change majors, etc. Kept money that could have been put into 529 over the years in a regular taxable account that can be used for whatever.
My educational expenses likely to drop as son #1 does not like dorm life and is moving back home and commuting to one of the Penn State's 4 year regional campus next Fall. Too bad I can't count the cost of a reliable car as an educational expense!