Analysis Plus VS Silverline bi-wired

Sounds like a nice system you've got--I'm not surprised to hear that the Stingray and the Sonatas go well together. I don't think that Alan Yun would expect huge benefits from bi-wiring (but of course he does recommend his own cables). My vote in your situation would be (3): do nothing. But of course if you can buy used cables cheaply, there wouldn't be much harm in trying the bi-wire setup and then selling the cables you decide you don't like. Another option would be using better jumpers between the two sets of binding posts.

In bi-wiring nothing you will loose except an extra-investment when you simply get another pair(either identical or different gauge) of AP or any different wires that you might like.

Having two pairs(especially of a different gauge) have the same or better effect than complete bi-wired setup you would get from Silverline. It also have a flexibility to swap between the binding posts and re-sale value when you realize that you don't need to bi-wire just in case.

With two pairs of binding posts on your speakers you can play also a few different ways: connect to upper jump to lower or vice versa. Same thing can be done if binding posts allow to use bare wires v.s. jumpers and do the same.

Despite speaker manufacturers might insist on bi-wiring of a speakers, it's more impacts amplifier and should be first tested with your ears. One of the negative impacts(to give you one little example) where the bi-wiring is not welcomed is increased noise level with preamp off or at minimal volume setting. If that takes place than you'd better off with single wires.

One of the positive effects you might expect that you can gain transperency, tighter bass control. There is an ability to use smaller gauge(smaller reactance as well) on each run that can give better expected result rather than running one heavy gauge speaker wire. By manufacturer's insisting using bi-wired setup it means that their crossover is designed with calculated reactance value ranges of speaker wires for its best performance.