I would have sold you my GT with DGteam , thing is you have swapped ONE 108Mbps wireless G router with MIMO RangeMax for another 108Mbps Wireless G router without MIMO RangeMax... the GT wifi signal should be worse?! - if not then the DG834PN must have been dying.
Iam opting for the DG834N myself as its wireless-N & looks nicer and has newer a broadcom chipset than the DGN2000 (or 834GT), it can be flashed with DGteam fw too, I just missed one on ebay for £3.20!!!