i think you might have a skill issue, some general tips to make it easier are
dont go for signals further then 2-3k in the start and once you have everything upgraded 5-6k is the most you shout go for, also look at the colors
, the closer they are to red the less "health" the signal has so go for green/light yellow ones only if it isnt like super close to you, also the bigger you make the triangle to more likely you will get it BUT it will take longer to ping,
the actual triangle size doesnt matter, only the circle that it creates afterwards and that circle has to be bigger then the one produced by the signal meaning you can make a smaller triangles on smaller signals