Yeah, the more gas you have, the better the action will function... (if no can is used and the factory block works, which yours appears to be working fine without the can)
But the can will add lots of back pressure, so you can adjust to function using less gas with the adjustable block.
There's guys here that know a lot more about that stuff than me. I have a piston rifle with an adjustable gas block that doesn't let anything gas or powder foul back into the action/bolt area. Got friends that shoot gas w/ cans though, and we've had to combine wits to get them functioning cleanly... and I use "cleanly" meaning less dirty.
