First of all, polishing off (just) failed clear and leaving the basecoat in any kind of uniform way is just about impossible, second, even if you can get the thickness of OC 2.0 up to 2 microns which is doubtful, even thinned out clear is 10 times that thick.
Let's look at this another way. Let's say 50 microns of clear is typically sprayed on a new car at the factory. If it would look alright with 40 microns or 30 microns, don't you think the car co's would do that (this is not entirely fair, because it's not just appearance but UV durability that comes into play also). The reality is that even your failed clear is probably at least 5 microns thick--so how is removing that and putting 2 back going to improve how it looks?