Since most tour players have no idea about accumulators, I would tend to think they are talking about their perception of effort. They use a variety of accumulators around the green, but probably think about the club staying low to the ground rather than zeroing # 3 and minimizing #2. Or whatever.
When they talk about 100%, their feet tend to come off the ground. Think wide open, barely reachable par five.
Completely agree with Hennybogan that their terminology is non-TGM, but their perception of "power effort" at 80% (should be 75% if my hypothesis stand up) is the equivalent of a triple barrel, whereas a four barrel is driver on a long par 5.
My opinion is that they're thinking more in terms of a percentage of "lag pressure" they're trying to attain (or sustain). That should be independent of the number of accumulators. I don't know how many pro's are using 4 barrels, but I suspect many have fully mastered 3 and are able to swing at varying levels of lag pressure with those 3.
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