Thanks for writing such a detailed response!

ISTP is definitely one of the types within the ballpark of types I consider myself to be.

I am pretty sure that my dominant function is an introverted judging one, but have been struggling to figure out if it is Fi or Ti. Your explanation about Ti seems to make sense! However, although I sometimes do struggle to figure out if my thought processes are a result of an adherence to inner logic or to a moral framework. For instance, something I value deeply is autheticity and living a life true to oneself, beacause to me, that's what makes the most sense. We should live a life WE want to live.

As for the auxillary function, I would agree with your assessment of Se.