In 2010, Darrin O'Toole returned as head coach, and the club looked to continue its success in the DV-8 league by moving into the main IAFL league. Trinity was placed in the IAFL Central division, alongside collegiate rivals the DCU Saints, the West Dublin Rhinos, and the league's most successful team, the Dublin Rebels. Despite a strong showing in early season games, including inaugural victories over the DCU Saints and the Belfast Trojans, the club suffered from poor form during the middle of the season, culminating in a 36–6 loss to the Saints in what would transpire to be their last competitive game before folding the following season.  2011 began brightly for the club, as they captured the IAFL College Bowl for the first time in spectacular fashion. Facing the UL Vikings in Limerick, the game finished 12–6 after triple overtime (7 quarters) and 3 hours and 45 minutes of play; an IAFL record for match length. The victory was sealed in the third quarter of overtime with a touchdown from Rob McDowell. Linebacker Stephen Carton was named game MVP. This form continued into the full IAFL league, as the club recorded three victories in its opening four games: against UCD, the Dublin Dragons, and the West Dublin Rhinos. However, the season would end poorly: the club was forced to withdrew from the league in early June due to a lack of players (the college's term having finished in May, many students became unavailable after this time). Despite forfeiting three games, running back Rob McDowell would go on to be named the 2011 IAFL league MVP. Trinity hosted a preseason charity game in November against rivals UCD, with Trinity coming out on top 7–0 thanks to a Rob McDowell touchdown. But more importantly the game ensured the children in Temple Street hospital received presents that were donated by both sets of fans and players. Competing in the newly formed IAFL South division, following the restructuring of the IAFL's divisional system, Trinity was set to embark on their 2012 campaign with early match-ups against the top three-seeded teams in the country. In their season opener, Trinity endured a crushing 55–8 defeat at the hands of the second-ranked UL Vikings. This was immediately followed by a 52–18 loss to the reigning league champions, the Dublin Rebels. Having begun the season 0–2, Trinity sought to redeem their poor start with a win against the number three-seeded Carrickfergus Knights.