I'm a little concerned now, as I'm ditching Comcast for FioS early next week.
Granted, I have 3 months of WTFast paid for, as it made a good impression on me, but that 300+ Ping is horrendous.
Where are you located, and what net service to you have from FiOS (think they offer 15, 50 and 75 mbps)?
I'm in Boston, and pinging the game servers gives me between 55 and 65 ms times... WTFast usually gives me 25-35 ms... sometimes I need to disconnect and reconnect after playing for a while, as the optimal servers seem to switch depending on the time of day.