Are Sagat’s jump-ins beating your far s.HK?? That’s shouldn’t be right. Like Kyo’s far s.HK, the tip of the foot is totally invincible. You can use it to go through Cammy shaft breaker supers if you want. Plus it comes out in four frames too. I never thought about the timing. I just press the button.
Dunno if that helps or not, but good luck.