My roundhouses vary. If they're blocking very loosely and leaving their elbows hang a little freely from their body, I'll angle straight in kind of like this dash ----> \
If they keep their arms tight agains the body and I can't got up into it, I like to kick people's forearms and hands so they can't effectively use them to block anymore. It's a good tactic with a sort of risk, but worth it. These roundhouses will usually start out and slam in. Like this ----> 7
Sidekicks are tricky, I can either go down and up or straight out. Down and up usually means that I'm using it to push them away to set them up for something else. Straight out is to stop or set up for a combonation.
Spinning heel kicks I set up with a few spinning back kicks. Throws em off and really pisses people off.
My push/front kicks are either snappy to hit someone's hand and make it less usable or to set up for a combonation of some kind. If not, then I bring my knee up to my chest and thanks to my ungodly flexibility I have the many options of going straight out and aiming for the chest, going up and hitting the face or turning it into a sidekick/roundhouse.
Those are my angles.