If it's functionally acceptable then so be it. An INCOG is a more expensive holster and as such the fit/finish should be greater. However, if that was T-Rex arms reply to you in regards to your complaint it seems they are unwilling to make it better for you and I can understand that position on certain terms and on others not so much. You as the customer should not have to be happy with a product that fails to meet a reasonable expectation so that the business can make more product. That should be built into their price, so if they need to earn more to produce more, then they need to raise their prices and then their quality to meet in the middle. As for writing off your concerns based on a focus of training blah blah, that's bull shit.
Anyways, the guy has a cult following of dedicated enthusiasts just like the INCOG that is comprised mainly of Glock fanboys, so expect to be flamed and told to just "deal with it and train harder" because he as an individual shoots good and does other stuff good too, blah blah internet rambos blah blah.
If you don't like it, send it back and ask for your money back and buy something else.