I recently updated my WRT54GL from Tofu 13c to Thibor 14 and I noticed that me internet download speed went from 4meg to 2.7meg. Why? It did not affect my upload speed at all. I reset the router to the factory default and cleared NVRAM before and after I did the firmware upgrade and I also did a hard reset. When I connect my PC directly to my modem (SB5120), I get 8meg download speed. I'm really confused. Is it save to go back to Tofu 13c without bricking my router?