As I understand it, jury struts' purpose is to prevent bending/buckling of the main strut during negative G conditions. Thus the jury strut should be perpendicular to the spar or it's tendency would be to buckle too under high negative G loads. When all was said/done with my Model 2 kit, I also had a little angle to the jury struts when installed per the manual. The angle was < 1.5 deg though and the simple clamp style fittings that attach the jury to the main were easily adjusted. This puts the jury maybe an inch or so further out the span of the main but preserves it's perpendicular orientation.

Chris