My recast time is also at 2.41 and I don't think having 0.01-0.02 difference will hurt much as long as you still pump mainstat if you're witholding upgrade. Unless you're doing extreme raids that require you to min-max everything.

The 2.40 GCD conundrum is based on the theorem that every oGCD like BFB/GSK connection synergizes with each other producing optimum result(s) and also situation that you're given a free time frame to "whack the dummy", which is what we aim for, even in raid environment, having less than 2.40 is also recommended by A4S clearer such as Sunny/Yan Dere, they both have crazy high SkS.

They got faster damage deliverance and more room for error, which is what we seek during encounters

Although those who're more expert in Dragoon-ing might want to chime in and correct me where I'm wrong.