As I already said before telnet is TCP so 3775 TCP is opened as your telnet showed.
So i would stick with the static PAT entry for TCP 3775 and do a sh ip nat translation | i x.x.x.x where x.x.x.x is the IP from where you are telnetting from outside and see if there is a translation slot. This way at least we'll know if the NAT is ok.
if the telnet is still not working but the NAT is ok then I suggest you use RITE feature to sniff traffic on the inside interface
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