I'm looking to understand the "general" nuances for the different sized razors listed above. Any tips to improve shaves for each size is appreciated.

Here is why I am asking:

As a Noob, I have been shaving mostly with the 5/8 and 6/8. I sent the 5/8 out to be honed by Lynn, and it is sharp as a tack.

I have noticed that my best shaves come from the 6/8 (closest shaves, least nicks). Even the newly honed super sharp 5/8 does not shave as good (for me). The 4/8 is the the toughest, with exception of AGT on the neck, where it is surprisingly easy. Regular WTG and XTG seem to skip more than shave.