If anything your SNR margin's quite high, considering you're 30kbps shy of full rate.
You're not connected at the maximum speed and could easily do so, but something stopping it...
Can your ISP not change your SNR profile for you? You are not doing badly at that on an 8meg package tbh but your line is obviously short and not noisy so you should get the full whack... Downloads different to synch of course and you could just be being throttled depending on what you are d/l?![]()