Hi there! I know your LO is 10lbs but don't forget, he's still just a newborn. My first was an angel baby and my second is textbook but with a hearty dose of reflux thrown in for fun, which can really mess things up. So long as you continue to try and stick with the EASY order, things will begin to right themselves with time.
With DS2, I did attempt Shh-Pat several times when he woke early from a nap but eventually I just had to just put him in the Ergo and take DS1 out for a walk or to the park and DS2 napped on the go.
Try to roll with the changes, even though it's really frustrating. As an example, despite all the baby wearing DS2 is an independent sleeper, naps quite well (minus reflux flare ups and teething) and has STTN since he was 4 months old. It does get easier, very quickly, you're just in the trenches at the moment.