I have a minor issue with my bowling, not exactly a problem tbh, but its something I don't understand.
My natural action allows me to get a lot of in-swing with good control. I mix them up with a few out swingers and straighter ones. All the deliveries I bowl are pretty much in my control throughout the innings except for the in-swingers.
Everything goes normal with the new ball, the ball curves in to the batsmen like a normal in-swinger, I can bowl some which move out, straighter ones, etc. things are completely in my control.
But, with a 15-20 over old ball, when I try to move the ball in, it just curves out at the last moment. Its pretty effective for me, coz the batsmen have no clue about whats going on and they keep edging it or missing it in on most occasions. But I have no idea why it happens, I have bowled with all kinds of grips and even bowled cross seam, but the ball always moves away at the last second no matter how much I try to move it in. I have to adjust my line and try to aim at the leg-stump to ensure that the ball moves away and stays on or outside off stump.
And now this is the most bizarre part, when the ball gets a bit more soft(35-40 overs old), it looks like the ball is moving in(just a hint of in-swing), and cuts away sharply after pitching. Almost like a leg spin delivery with a bit of drift. But I have no clue how with the same grip, I can achieve too much in-swing at the start, and then out-swing and later the ones which just pitch and move away.
I m pretty happy that it happens, but I would like to know some technical stuff behind it so that I can use it more effectively.
I bowl somewhere around a 110-120kmph (so m definitely not reversing it), the release(when I bowl in-swing) is pretty similar to Kulasekara. It would be great if someone can explain what actually is the reason behind all this.