In general for rectification with the person's skills and abilities use the svamsa (navamsa lagna). First house showing natural in-born abilites, 5th showing things they learned but still have natural skill and ability with, 9th house showing what they are good at but after having studied and worked at it.
A few notes to add on navamsa rectification:
If Saturn is conjuct an inimical planet in these positions it will delay the results, for example Moon and Saturn in svamsa, will make some one who is a singer with great stage fright who will not be able to open up there voice fully till after saturn maturity at 35.
Planets in 6,8 or 12 will often give opposite results; for example, Ketu in the 5th makes one have good mathmatical abilities (ease working with numbers) and in the 6th the person will dislike numbers and even balancing their check book will be avoided.
If the planet isn't there but is lording the sign it can have an effect but much more slightly. For example, Moon gives singing and Sun gives rythm and instruments, so if you have a bass guitarist and you are debating between a Cancer and Leo navamsa lagna you would definately go Leo, but you wouldn't predict otherwise from it.
Venus in the 12th as karaka for marriage in the D-9 will make a person not interested in marriage. Venus afflicted in D-9 will have similar results.
Atmakaraka in svamsa will make a person born into a well to do family, if it only lords svamsa the family will have potential but may have to rise to affluence. If AK is in the 7th house the person will rise to affluence after marriage. AK in the 8th house will cause chronic diseases, and six house will give similar results (remedied by fasting on full Moons).
And then back to an old post, the sexuality of the person indicated by the navams is often a great source of rectification. Moon in 7th or trines makes a very horny person. Also check out the 2nd house in the navamsa rule with Mars and Venus aspects, its in the first book of Jaimini, but shows how faithful or not a person is. This helps me in rectification a lot as well.
Jaimini gives little distinction between Karakamsa and Svamsa, but for rectification svamsa is what is used.
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