I think you might be forgetting that most fatal and severely detrimental mutations will be eliminate prior to conception or prior to birth. The odds of a sperm cell conceiving are a billion to one. Egg cells have gone through fewer divisions and will have fewer mutations.
Just something to enter into your equations. Personally, I think your formulas are not very well thought out. The fact that you haven't mentioned this as a factor tells me you haven't studied the problem.
It is refressing to encounter a real argument, but I think as you study it, you will find others have been there before you.
It really makes you wonder about people who seem to think that no one in the history of the universe could possibly have considered such elementary ideas.