Congratulations, very nice.
I was also reading your webside.
I know it has a bad rap here and you seem to be tired of your job but especially in your case I would consider to put in 1-2 more years.
My reasons would be:
1. With the current very high stock market valuations and historically low bond yields your planned 4% withdrawal rate is much less then 95% safe.
When you look at all stock market years with a Shiller CAPE close to 25, then a good amount of them failed/where close to failing (1902, 1907, 1929, 1965, 1966, 1999, 2000).
2. With your current wonderful and insanely high saving rate due to your high paying jobs you just need a single additional year to go from a 4% rate to 3%, which until now never failed! With two more years you are @2,5% and you can live off dividends with a 100% stocks portfolio for the next 60+ years.
3. Because you are planning to have kids, your spending rate will go up some and also at least one of you two will have limited earning capacity for some years.
Good luck and all the best!
Marcel