Yeah, that combo works really well. I haven’t used the SNACH yet, but a Recce5 on a properly gassed gun (Colt) is really good.
I generally consider tuning aft of the port to be a bandage, and adjusting the port to be a TQ, but if you’re starting from a decent port size (Colt), throwing a heavier buffer in it is usually all you need, with a good 5.56 can.
And the Recce5 sounds awesome. Shoot some steel with it if you haven’t already. You’ll be shocked at how loud the bullet impact seems. Its such an effective silencer that the impact stands out.