Trash the AMS and don't look back. The Yen-Lo is a hardpoint-starved 'Mech, and you only get the best performances out of it when you leverage every bit of tonnage you can to maximize what few advantages it has. Namely: an AC20 arm, an empty LT with an
amazing shield arm, and CT energy hardpoints that you'll almost certainly die before ever losing. Good use of cover will protect you from missiles better than a single AMS, and... well, the Wang is not a support 'Mech. It's a duelist. If it's an escort 'Mech you're looking for, there are far better mediums for that, either with dual AMS or ECM.
My go-to Wang build, which I loved the first time I tried it and have only grown fonder of every drop since, has been the AC20+SNPPC build (posted earlier in the thread too), which
looks like this. Short-duration lasers are best if you don't want to eat the tonnage for a SNPPC. With lasers, I would build it
like this.