Which longacre for bump steer

I agree with Blu as to the first paragraph and have no comment as to the second cuz I got's no experience there.
I also think that's an awful lot (lol) of caster for a streeter.Well not awful exactly but a lot more than you need at speeds under 65.
I suspect that if you cleaned the alignment up to -.6camber and 4 to5 caster,and like Blu says about the toe; then set your rideheight sooz the LCAs are in the sweet spot, and played with the tire pressure a bit, well your bumpsteer should almost disappear, or at least the most annoying part.
Compensating for 6 plus degrees of caster could be an all-day job.
If your backspace is pushing the wheels to the outboard that will also probably have to be changed. If you do this, do it before the alignment/ bumpsteer mods. And adjust your wheel-bearings too.
I tried that wide-track cuz I liked the look. But it messed up the scrub radius,and the tires wanted to climb the edges of every rut; man that was annoying. And I mean even little depressions.Centering the tires up got rid of that.......pretty much. After the summer was over, I swapped out the sticky front rubber, for new Cooper Cobras, and then said goodbye to that nervous twitch,forever. Cuz those stickies barely made it thru the summer, and I was of the opinion that they were too expensive to replace, for the fun factor they were providing.
Yeah, I remember that summer with much fondness. Well except for the hours spent on the alignment rack to get it dialed in.
With the Coopers I just drift. Different kind of exciting.