It is true that Captain Sim has weights are somewhat different from real world weights.  Since I assume CS would be as able to discover the real weights as you or I, I am also assuming this was a design decision made for reasons I could not even begin to guess about.

I am also assuming that having chosen those weights they designed the aircfraft to operate properly around them.  Since operating within those parameters is working for me, I would have to be convinced otherwise.

I usually make fairly short hops, because with everything else I am doing with this a/c right now, I would need 48 hours every day!  So I'm fairly light, and my vref is surprisingly low, but seems to work.

If you want to edit your weights, you're a braver man than I  :o