Failed attempt at the slim wallet (modified version)

I have attempted to make Philip’s slim wallet with some modifications (slightly longer and flat sleeve on one side for my checkbook, added strap to close). It all started so nicely until the final stages. I used pricking iron (3mm) to mark the inside stitches. Because the chain link side was too thick, I ended up using an awl (diamond) to puncture the markings all the way through. The end result was somewhat decent stitching on the inside and just plain terrible on the outer/face side. Naturally, I will be blaming the perfect Philip for my own imperfections (ok, not really) but...I did watch the stitching video but clearly not getting something. Could you please share your own techniques on perfect stitching using an awl (with pricking iron my stitching looks fine)? any aha moments? the perfect awl? the perfect grip? Thank you!