Very interesting and informative thread. I have the same issue - when running, rowing, and ice hockey, I can hit 190+ bps easily but only 160 on the bike.
I suspect there is a skill issue: I have decent technique in all those sports, and can really hammer efficiently. I can't do that on the bike right now, even at 6'2 / 245+ doing 100 miles per week. (Well, when the roads aren't covered with ice and snow)
Maybe pedaling and skill drills in addition to hill/interval work? Either that or perhaps my legs aren't strong enough to push myself hard enough.
That is my goal this year.
(Well that and drop 25 lbs....)