The Ratchamatic has the same holding power as a switchable ratchet, it's advantage is less friction on the release (because the ratchet turns off as soon as the tension is released). If you feel the pull is too hard when the boat's fully powered up, consider adding purchase. The price you pay for the greater ease of holding the mainsheet (beyond the dollars), is that more line needs to be hauled in to sheet in the main. And more line to run thru more blks on the release. This is where the smaller diameter lines (and particularly the splice to even smaller diameters for the part that just runs in the blks) becomes beneficial. These smaller diameters run very easily thru multiple blks, which is important for fast releases.
And although I'm sure that personal preferences and skill levels dictate whether a skipper chooses to cleat the main or not, if I feel that it's blowing hard enough to flip the boat, I'm uncleated. And having enough purchase to hold the mainsheet comfortably is very important. I have 5/16", tapered to 3/16" on both the SC20 and Flight Risk.

Dave