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@rpm
chainstay length is absolutely critical to how a bike rides, slack seat tube angles will need longer stays and steep ones can use shorter.
Bear in mind for the road, the closer the rear axle is to your arse, and the nearer that axle is to your BB, the more of the road you are going to feel, this is why many track bikes give a harsh ride, but are responsive to what you are putting through the cranks. the link you posted about higher BBs shortening the stays bears this out. simple when you think about it.
a good road frame will be the perfect balance between the two.
this is why so many custom builds fall very short of the customer's expectations, the hard work has already been done. I would say a fixed frame for the road should be the same as a nice road bike that fits you, but with a 10mm higher BB height.
once you start tweaking seat and head tube beyond sensible parity, you have to be spot on with the angles, this is where people also fall down, a bike with a very long top tube compared to seat tube will usually be ok, within reason, but the other way round and it may handle like a pig with rabies ..
it looks like your amended geometry was the right thing to do SB