Gamer profile is if memory has not failed me is one of the DLM profile options Sky use.
1800Kbps to 2373Kbps, possibly an extra 0.5Meg from ADSL2 is what my farina1 site estimates based on your current figures. Am interested to hear what sort of figures others are getting?
We have seen the odd rare 3Meg sync at these speeds, but it is rare.
You can do either, a reset of the router does nothing exciting, just lets us confirm what your target margin is.
As for those getting faster speeds, actual data rather than heresay, as I've seen lots of people claim lots of things, but on inspection there is a good reason. For example attenuation is lower for a neighbour, for example if you dragged your house closer to the exchange to shorten the run of copper by 3dB you might gain 0.5 to 1Meg