Gangplank's Barrels are Too Big and Way Too Srong?

I'm a filthy casual, but I think it's a little strong.

-He has the ability to spam barrels to create a large blast zone He starts off with two barrels, but two barrels is enough to keep you zoned behind tower. I either have to wait a minute for them to go away or risk destroying it.

-The barrels have massive armor penetration The armor penetration is 60%. That's a lot. I kind of think it's too much. Last Whisper is way below that. If I can't build armor to defend against the blast, I can't do anything about it except wait it out or destroy it while he's away.

-The risk and reward of destroying a barrel seems to favor GP too much. It's very safe activating them with Parrrrrrrrrley. He can stay a relatively safe distances away from the barrel to detonate it, which zones melee champions, which most top laners are melee, but also marksmen or mages because if they're behind the barrel after it gets to 1, hey can't get close enough to him without risking a huge chunk of health.

I just think it's too easy for Gangplank to spam barrels and chunk your health down to nothing. Maybe I'm not doing it right. Maybe I'm supposed to go past the barrels before they tick down to one, but still, if I get caught, I lose a considerable chunk of heath and I can't do anything about it.

I think it could be improved by -Reducing the barrel at the beginning to one (this seems like too much.) -Decreasing blast radius -Have armor penetration that increases with rank instead of a flat 60% all game. -Maybe even then reducing it from 60% -Award more gold for destroying the barrels (This seems difficult and really dumb since most things like this don't award much gold either like Heimerdinger turrets.)