That 1988 team was no doubt terrible from the line. IMO the difference is those guys were simply bad free throw shooters. Stevie Thompson just wasn't a good shooter. Seikaly was always in the 50s. Coleman improved a bit and was around 70% as a foul shooter as a senior. Sherm was always just OK. They were who they were.
Nate Kingz was 81% last year! Now he's in the 50s. I would bet my life that Kiyan was a very good free throw shooter in high school. Starling was 71% from the line two years ago at SU -- now he's afraid to get fouled.
In short, I don't think 1988 was capable of doing better. This team absolutely can do better, they just aren't right now for some inexplicable reason. The whole roster minus George has the yips.