Mercenary - Armor Break x Poison x Explosions

I've been playing mercenary for a few hours now, and i'd like to make an endgame worthy build using the mechanics ive been enjoying the most so far.

I found a pair of Corpsewade near the end of act 1 and it dramatically affected my build. I slapped Corrosion and Bursting Plague support runes on it, so every corpse on the ground would blow up with poison, breaking armor, and bursting some more poison when new targets died in there.

Outside of these boots, the abilities ive been using are mostly Armor Piercing Rounds, High Velocity Rounds, Gas Grenades and Explosive Shot. Armor Piercing Rounds is great to apply a lot of armor break on mobs and bosses, with High Velocity Rounds being used to consume that debuff for big damage and stun. Right now i'm using Explosive Shot to consume multiple Armor Break debuffs at once using another support rune, or to ignite any poison cloud that formed over the fight.

I used my ascendency to go Gemling Legionnaire, this way i'll be able to replicate Corpsewade's current setup on my Gas Grenades so I can use that on bosses when no corpses are available. I'm planning on using any support gem affecting armor break twice on different skills.

I've also been running both Shard Scavenger (reloads bolts when consuming armor break) and Herald of Ash (high velocity rounds overpowering smaller enemies triggers an explosion, which consumes poison clouds from gas grenades or corpsewade).

I'm not a long time PoE player, and I usually get overexcited about multiple interactions in games like theses, instead of focusing on a single good interaction.

The passive tree i'm headed towards looks like this: https://maxroll.gg/poe2/passive-tree/5nalx0ha
But I dont know if i'm overextending, wasting points trying to reach far off nodes, or trying to buff too many aspects of the combo instead of focusing on a single one.

Do you guys have any advice? Between the armor break, poison damage, and poison cloud explosions, which mechanic should I focus the most points and efforts on? I breeze through everything right now but in my experience, my builds usually whiff when I hit the real endgame / hard content.