over time, 27/7Mbps sustained (30/7Mbps boosted) is quicker than 22/5Mbps sustained (60/10Mbps boosted).
losing the really high initial rate stinks, for sure, but trust me, if comcast offered you a choice between 22/5 (60/10) and 27/7 (30/7), you'd want to go with the 27/7.