not possible even with 6 ps. 
It bounces on plate almoust every time. I tried to play as fake peasant and it even bounced on war horse armor. 
This mod need some OP peasant weapon.
you are doing something wrong than, you have to get used to the pike you want to use and you have to master the techniques. ps and athletics matter for the damage, but if you bounce off; the problem is more the way you 'insert' (

) your weapon in the enemy end where you do it. if you have a pike, you often have a big range and you can see the whole body of the enemy: this means you can just choose wich body part you think will do the most damage and you stab there. about stabbing from close range: try to pivotate when you stab and a good trick (when fighting multiple enemies) is to get in the middle of them and attack one guy, turn around attack the guy that is trying to hit your back, turn around again... (remember blocking here is very important but also very easy. i can cause 3 teamkills by doing this and the rest i kill myself: i once came at the flag that was surrounded by enemies and was almost down, i jumped into the group and they all started attacking. i just dodged most of them and blocked the rest while focusing on weak players that i could kill easily. at the end i probably killed as much people as the enemy had teamkilled and i cleared the flag by myself).
this is mastering your weapon and getting to know it, if i play with any weapon with a different reach i immediatelly die because i always bounce off.
there is one thing i really want: red pike to teach me how to use the pike