Calling All ASUS RT-N16 owners. Can anyone confirm and support a few issues i'm having?

Background:
Firmware: AsusWRT Merlin edition latest one (Nov 2012)
Hardware: A1 version

1. Transferring from PC (wired) -> Laptop (wireless), i'm only getting max 9.5MByte/s transfers.
Background: default on all wireless settings except "N-Only" is selected, b/g protection is disabled, WPA2-AES authentication

2. Using "Download Master" usb application but i cannot connect to it from WAN.
Background: have enabled port forwarding for 8081 and 9091 to redirect back to router and also enabled WAN is checked but i am never able to access either "Download Master" either through transmission remote or through router web interface from a WAN address. i can however connect from LAN perfectly.

3. Using any build version of DD-WRT, i have a degrade in connection speed for both LAN and WiFi with WiFi being most significant as my transfer drops from 9.5MByte/s to 6ishMByte/s. Anyone else facing this as well?

BUMPing. anyone can enlighten?