recitifcations can be done best if we know few imp. dates in life like wedding date and time, wife's DOB and kids DOBs(if any)
i use krishnamurti paddathi(k.p) to derive precise sublords or cusps and sublords of 2nd, 7th and 11th cusps are connected to ruling planets of spouse's horoscope
similary sublords of 2,5,11 cusps are connected to ruling planets of kids horosocopes
if single, then use sublords of 3,4,9 to find from siblings and parents
also many details like education, year of graduation etc will help
i rectified few
http://www.illuminate.in/discus/forumdisplay.php?fid=45
i also use horary method sometimes