The Vandersteen manual is easy.... seriously pick up a math and science based skill few have and it will help you get better sound in any room with any system.
print out the 3a sig manual
ignore tilt adjustments ( there I would follow what your manufacturer recommends - normally this is a function of tweeter to ear distance but can also be pretty subjective especially with metal tweeters with ring and breakup in hearing frequency.
as for toe in IMO most people have too much
are you treating first reflection sidewall point ?
print out the 3a sig manual
ignore tilt adjustments ( there I would follow what your manufacturer recommends - normally this is a function of tweeter to ear distance but can also be pretty subjective especially with metal tweeters with ring and breakup in hearing frequency.
as for toe in IMO most people have too much
are you treating first reflection sidewall point ?