I think you need to read what Richard says a bit more carefully, in the link you posted he states that a 1" bulkhead work poorly
with a 1" standpipe, not that they work poorly as you stated. Also when he talks about 350g and bulkhead size he is talking about tank size not 350gph flow rates as you also stated.
Quote:
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Yes a 1" bulkhead can flow 600 gph, it can actually flow 1500 or better, depending on the head height and the length of the drop. (simplified) Can a 1" durso standpipe/drain system do that--without issues (noise, gurgling, flushing, what have you)? No it cannot.
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As per the link I provided and from personal experience a 1"
can handle 600gph with no issues