I get everything working without playing around MACs and SSIDs.

I used QuckSetup to connect 330 to 500gP in repeater mode. It worked well.

But I had problems with encription (WPA-TKIP or AES).
Problem was solved with setting up repeater in Advansed Settings.

Wireless - Advanced - Repeater
All I had to do - to change
Enable Individual Wireless Setting to "Yes" and
Authentication Method to "WPA-auto-PERSONAL"

That's all. Everything works fine for about month

I have:

{internet} - (wl-500) - wifi - (wl-330) - wifi - (other computers)