I would say 5-10% could be the difference in 30 yards. I mean, that's all of what, 10 mph swing speed difference?
And I agree, that's why I posted that one specifically. The one drive I found of Bubba that was full bore all out trying to crush it. And it went over 360 yards.
...And the course conditions could have had a significant impact.
I can't tell much from that video. However, I know that when you watch some of these bombers on flat, wet courses where the ball nearly plugs after landing, they don't get nearly the distances that we see them get on other courses with dry, windy and firm conditions that allow them to carry bunkers 300 yards out and end up with drives of 340+. You rarely hear the announcers talk about their driving distances on those (wet) days.
There was a tournament last season where guys were letting loose on a particular par 5. Don't remember the tournament, and I'm not sure if it was an official PGA event. Anyway, they had a swing speed analyzer on the tee box and we got to see Tiger, Bubba and DJ all rip their drives. Bubba and DJ really went after theirs, and their swing speeds I believe were in the 124-127 range. The carry was like 290-ish if I remember correctly. Tiger was just a bit behind them with a 122-124 swing speed and about the same carry.