Honestly,
Not saying against the JP recoil system but the Blitzkrieg buffer system will eliminate all of your problems.
And more than likely surprise you with less felt recoil.
Everyone I know runs this system and loves it. Most big time shooters run it.
Their web site has a lot of information as to which buffer and spring to run as far as barrel length.
Light grease on the recoil spring to get rid of the spring noise.
Try it, it will put a smile on your face when you shoot it.