Re: adjustable ball joints
Those Qa1 are not adjustable by angle but by preload. They are designed for circle track racing. I don't think they are what you are after.
SPC makes 10 and 20 degree angled ball joint plates. They can be canted in or out for whichever orientation is desired. This would only work upgrading to their uppers.For the lowers if someone wanted to spend a bit of time you could make an angled balljoint spacer/shim for both sides of the control arm. Then when the ball joint is secured it will be on the angle desired. It would take some machining and time but would be a very cheap and effective way of negotiating that 30* of ball joint travel.
edit* -20 degree plate,
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*sorry just remembered the lower is a push in. What I was talking about would be suited for a bolt in lower.