Singularity QOL Suggestions
I currently have him P15 and have probably put close to 50 hours into him, and I think he's in a great position and strength at the moment, however there are a few QOL changes I'd make to him.
First being, there's many occasions where survivors will be sat behind a fence or a branch of a tree and you can't infect them even though you can see them. Can end up wasting precious time trying to infect them initially, then having to set up another biopod, then going into it and infecting them - might not seem like a lot of time but it can add up.
There also needs to be some QOL changes when he's near a hook and you get that 5 second cooldown/slowdown - a survivor could be on death hook, you've just killed them, go to check a biopod then come out and you're given that slowdown, even though you're not camping the hook. Only thing I can suggest is to reduce the range from the hook in which Singularity gets the cooldown/slowdown or reduce it to 3 seconds instead of 5.
Just these changes alone will make him feel better and smoother to play