"We all know that 1/4" per foot is the minimum slope for sewer pipe
Suggest you learn the difference between a sewer pipe and a drain
pipe. Then move onto a building drain, all are different and are sized
differently with different slope/grade. Your looking for trouble if
you increase greater then 1/2" per ft. over a long run on a building/
house sewer, this becomes even a bigger problem today with low
consumption water closets.
* lets add a sewer should never have a 90 on it.
"Old myth about too much pitch has been debunked by plumbing
Not true, they just don't care anymore. Most of these guys today would
have a hard time being apprentices 40-50 years ago.
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