Here's a simpler approach. With whatever jib/genoa you have up, for trimming closed hauled (pointing as high as you can into the wind), slowly point the boat into the wind so that the leading edge starts to luff (curl). The lead for your jib/genoa sheet should enable the leading edge of your sail (the luff) to break at the same time from top to bottom. If it breaks on the upper half first, then your lead is too far aft. If the sail breaks on the lower half of the luff, then the lead is too far forward. If the sail breaks at the same time all the way up the luff, then you have the correct position for the jib/genoa lead. Of course, a lead (or block) on a track is important so the lead can be adjusted easily and quickly. If the wind pipes up, and you wish to depower the rig some, then you can move the lead aft some so the wind breaks up high first, which will spill wind up high and that will help depower the boat. If the wind increases too much, then you have to consider a smaller jib or maybe reefing the main, etc. With a larger genoa, the lead obviously will be further back on the track. After falling off the wind you don't need to adjust the lead on the track, but you need to create a nice slot between the main so that the leaches (trailing edge of the sails) match. This is accomplished by easing off the boom vang increasing the twist in the mainsail to match the natural twist in the jib/genoa. Asymmetrical spinnakers are adjusted and trimmed based on the velocity of the wind and the boats angle in relation to the wind. You can't sail too deep with an A-kite like you can with a spinnaker with a pole. So, you have to drive the boat to weather to increase the apparent wind. Once you find your course, you ease off the sheet until the luff (leading edge) starts to break. When that happens, the trimmer just pulls back enough to eliminate the break (or luffing). Most A-kites have two control lines that adjust the luff: the halyard and the tack line which might go to an adjustable/retractable sprit, or to the stem head fitting of the boat. As you sail closer to the wind (and you can sail a lot closer with an A-kite verses a spinnaker with a pole) then you need to tighten up the leading edge by pulling up on the halyard and pulling down on the tack line. As you fall off the wind, the sail needs to be opened up some so the halyard is eased. When there are wind gusts that vary, the trimmer, on a race boat, will call out to the helmsman to head up or down based on the pressure the trimmer is experiencing. If the pressure is too much, the helmsman is instructed to fall off. If the pressure decreases, the helmsman is instructed to head up. Hope this helps.