Is this an overcarbonation problem or a serving problem?
If it's overcarbonation, as in your beer feels/tastes too carbonated for the style even after you've poured a couple pints, try venting and leaving it disconnected for a day or so, then reconnect at a lower pressure.
If it's just a serving issue, try adding 2-3 feet to your beer line and see if it helps. Might want to check your gauges as well - by the numbers, 7 feet should be long enough for that temp and pressure, so maybe you're actually at a higher pressure or temp than you think.
Anvil Horn Brewing
Wee Heavy Scotch