[Champion Mini-Rework Rough Draft] Rammus, the Armordillo

According to the link provided, Rammus is considered a Vanguard tank: someone who engages the the enemy team and locks them down proactively.

As it currently stands, however, Rammus falls short--very short--in that regard, having only a miniature Malphite ultimate in the form of Q - Powerball and a single target taunt in E - Puncturing Taunt. In fact, between his passive, the armor reduction on his taunt, and the damage reflection of his W - Defensive Ball Curl, he feels more like a counter-skirmisher warden that forces his opponents to kill themselves.

But aside from what class or subclass Rammus identifies as, there is also a question of what role he is best suited for. While he is naturally inclined to roam the jungle, I feel as though he would be better as a support given his ability to lock ADCs out and to push towers with his structure-damaging, wave-clearing ultimate.

In this proposed rework, I aim to redefine Rammus as more of a Warden Anti-Skirmisher--focusing more on locking down an opponent and possibly peeling for his teammates as opposed to outright engaging--as well as being more useful as a jungler and as a support (or, in lieu of being a support, as a situational top laner).

Passive - Spiked Armor: Original is scrapped; instead basic attacks against Rammus reflect damage to the attacker proportional to both the damage received and Rammus's bonus armor as magic damage. [Better for jungle and has more synergy with rest of kit]

Q - Powerball: Now knocks minions aside as long as Powerball is active instead of ending the effect with an AoE knockup. No longer has an AoE knockup on champion or neutral monster hit (single knockup instead). [Minor update, possibly unnecessary]

W - Defensive Ball Curl: While active, passive now deals AoE damage centered around Rammus. [Even better while in the jungle and in the thick of teamfights]

E - Puncturing Taunt: Now reduces Magic Resist, but reduces less Armor than before. Reduced duration at all ranks but resets the AA-timer for the target upon use. [More synergy with Passive, W, and Ult, as Armor reduction is less useful with the change to his passive]

R - Tremors: Decreased overall damage, but now "destabilizes" structures, increasing all damage they take for a short duration. [Might be potential for a pseudo-Ohmwrecker+Alistar's E - Trample lovechiled in here]

EDIT: Also, this is not a call to give Rammus a voice-over rework or anything like that. Part of Rammus's charm is that he is a simple 'ok' champion.