Hi Slicepong, yes these long sidespin serves can be really effective against some players for sure! No reason why not to continue with the 80/20 ration until players are able to attack it strongly and put you under pressure. As long as you keep mixing up the direction as you mentioned and put in the short ones to keep them guessing. Some good serves to compliment this long sidespin serve would be a long backspin which gives the opponent another spin and shot to think about.
I also like to use a short serve into the forehand corner, players often struggle after trying to return long serves, naturally they try to step back to give themselves more time and then it’s hard to adjust and get in for a short forehand ball. The key thing with serving is being unpredictable and mixing up what you do. But again at the same time if there is a sere certain opponents really find hard then there is no reason why you can’t use it a fair amount!
Thanks, Dan 🙂
