Ah. I too faced this issue when I moved to xpress 1000. Issue is with the sync rate, when it is set to 2048kbps, the connection seems to max out 1.75mbps for some reason. call up the cc, and and complain about low speeds, they'll give me your exchange's sde or equivalent's number, call that person up and tell him you're getting only 1.5mbps, he'll prolly increase the sync rate to 4096kbps and you'll get the entire 2mbps 
yup, i think that just might be the solution. except I have no idea how to get it done. Been in contact with the guys at the local exchange and they say that 1.5-1.6 mbps is the correct speed for a 2mbps plan and I shouldn't expect more. When i tried to explain and convince them to change the downlink to 4096 they said that can happen only when I go for a 4 mbps plan. Currently all that is not handled by them, but directly from prabhadevi servers and those guys will only make the change if I go for a 4mbps plan.
I only see a 9999 per month 4 mbps plan. That's too steep. Else I wouldn't mind taking up a 1000-1500 low fup limit plan for 15 days or so till they reset my downlink and then revert to the 1000 plan.
Alternatively does anyone have any contact numbers for the prabhadevi center where the servers and speeds are managed?/
yup, i think that just might be the solution. except I have no idea how to get it done. Been in contact with the guys at the local exchange and they say that 1.5-1.6 mbps is the correct speed for a 2mbps plan and I shouldn't expect more. When i tried to explain and convince them to change the downlink to 4096 they said that can happen only when I go for a 4 mbps plan. Currently all that is not handled by them, but directly from prabhadevi servers and those guys will only make the change if I go for a 4mbps plan.
I only see a 9999 per month 4 mbps plan. That's too steep. Else I wouldn't mind taking up a 1000-1500 low fup limit plan for 15 days or so till they reset my downlink and then revert to the 1000 plan.
Alternatively does anyone have any contact numbers for the prabhadevi center where the servers and speeds are managed?/