No surprise that this is the case considering you had one of the league’s best dual rushing threats, in which one of them almost took the rushing title, this season.
“The Tampa Bay Buccaneers had a conservative offense in 2015. Or at least, they did in conventional terms. They just loved the running the ball. Thomas Bassinger tabulated some of the key statistics, and concluded that the Bucs ran on 57.1% of all first downs over the season — that’s fourth in the NFL. That sounds like it would be too much, but the Bucs also gained a league-high 6.24 yards per play on first down — apparently, their first-down strategy was working.” – Reported by Sander Philipse
More on this here; Buccaneers were the best first-down team in the NFL last year