Cant combo trails

having real trouble with trails have tryed a few characters,can combo hits and kicks together,but have problem with combos into going into a fireball,or tiger upercut after normals ,eg sagats close mp into hp tiger upercut.guiles cr mp into hk flash kick.ryu cr hp into hadoken or cr hp into shoryuken.i practice geting faster untill move does not come out because inlputs to quick,slow down input no i missing something do i need to cancell a move to combo, ive tryed adding a 2dash between moves witch seems to speed up some moves coming out but still no main is sagat hellllllllllllllllllllllllllllllllllllp



very helpfull thks alot ended up watching the whole series cheers