Kingfish do not sit and wait to be found. They chase, and a trolling spread works because a moving lure looks like a sardine running away. Most fish lost on a troll come down to speed and line length, not the lure, so fix those before colour.
Speed decides what the lure does underwater. Too slow and it sinks and tangles; too fast and it skips the surface, leaving a wake no fish believes. Kingfish want a pace somewhere in the middle, adjusted for how hard the current runs, because GPS speed over ground is not the lure's speed through the water. Watch the rod tip: a constant hard shake means the lure runs wrong; a dead tip often means you are too slow and the current is pushing it ahead of the boat.
Depth comes from the lure's own dive rating, or a small weight ahead of it if you need to get deeper. Kingfish sit deep in the middle of the day and come close to the surface at first light and near sunset, so set depth first and adjust everything else around it.
Long line gives the lure room to work, but you feel the fish late and lose time setting the hook. Short line feels immediate, yet the lure stays in the boat's wash. Run different lengths at the same speed and stay with whatever draws hits. Heading matters just as much: troll with the tide or across it at an angle, not straight into it. Into a running tide the boat slows while the lure swims unnaturally fast; with it, you need more throttle to hold the same rhythm. When the tide is strong, go with it and come back on a different line.
Birds are the cheapest fish finder you have. Birds gathering and dropping fast onto the water mean bait underneath, and kingfish under that. Read the water too: a dark patch that keeps moving, small fish breaking the surface, or a line of foam with no clear cause. Do not drive into them at speed; come in quietly and let the lures pass beside the school, not through it.
Trolling means loaded rods, moving line and a moving deck, a real hazard even for experienced crews. Keep clear of the line path, never wrap line around your hand, and make a wide turn before running back over the same ground. The B7R app gives tide times for Shuwaikh and Shuaiba and sea state before the first line goes out. A big kingfish does not come over the gunwale on the line: back the drag off after the first run, let it go, then pump it back gently. Keep it in the water until the net is ready, and never grab it by the tail while it is green, because the teeth and gill plates cut. Log the length and weight, then release it properly.
If this is your first troll, start with a short line and a mid-range speed and watch what the lure does. Download B7R on Google Play and check the tide before every run.