Well, I went and got a hefty engineer's hammer and beat the hell out of this thing, and STILL no luck.
I'm pretty much taking turns between that, cranking on it with the pickle fork, and soaking it in penetrating oil.
I had the thought of cutting through these with my angle grinder. I suppose I could slice the top and bottom of the bolt off, and maybe try to stab or even drill the bolt out of the spindle. I'm really ****ed off about this because these are now the only things holding me back from being done. The upper arms are ready to come out. I was actually working on them lately so as not to be driven insane by the lowers.