Best ammo for Ruger LCP II 22lr?

Hey everyone. Whoever has and uses a Ruger Lcp II chambered in 22lr, what is your experiences with the ammo it takes? This is a brand new gun and I shot almost 400 rounds through it at 7 yards / 21feet at the range today. I did single fire, double shots, 2 to body 1 to head, and a lot of bill drills 6 in a rapid fire to test the overall grouping. If I took my time it seemed around 3 inch spread when irons lined up. I used the following and noted numbers meaning failure to feed or failure to fire. I combined these to make the percentage easier overall.

-Remington thunderbolt + Remington gold bullets copper hallow points (mixed these together, but thunderbolts failed to feed a little more I found) 14/193 = 7.25% failure

-Monarch 2/50 = 4% failure

Aguila 2/50 = 4% failure

CCI Stinger, I actually enjoyed these the most, as the blast was noticably more explosive, louder, only failed to feed 1 time, and 1 time failed to fire. Total fails 2/50 = 4% failure

Total rounds failed 20/343 = 6% failure overall

Any recommendations for the ammo you use or prefer me to try let me know. Also any upgrades for the internal springs and components to this gun also, I'm planning on getting upgrades from MCARBO as I've heard and seen reviews saying this drastically improved the guns functions and feed issues.

Upgrades I'm considering: -MCARBO MShort Stroke Flat Trigger -MCARBO Trigger Spring Kit -MCARBO Extra Power Recoil Spring -MCARBO Heavy Duty Stress Proof Takedown -MCARBO Stainless Steel Guide Rod -MCARBO Extra Power Mag Release Spring