[Edbo]

The uppers supplied with FFR's are made by PP and similar to your pic, but with straight tubes instead of curved. Same Chrysler balljoints.
Mine are very easy to adjust. I use a Pole Position caster/camber gauge and have experimented extensivly with my FFR. Here's what suits me best, with a Flaming River 20:1 rack:
3 degrees positive caster, zero camber, 1/16" total toe in.

I ran 5 degrees caster for a while and it tracks down the highway solid but steering is quite heavy in turns.

Something that has a strong influence on cornering is 'wedge'. That's the corner-to-corner weight distribution. If you have a way to weigh each wheel wedge can be adjusted to near zero by adjusting spring preloads at the front end.

Here's a tip for you: Factory Five had a recall of those PP arms recently because of improper hardware supplied by PP. The 7/16" nuts supplied at the pivot points were not locknuts and there were numerous cases reported of the nuts falling off, unknown to the owners. Luckily, no one reported an accident because of it.

HTH, Ed