It's hard to find a FF movie that doesn't over-rely on jump scares, or those ghosts with the big, stretchy mouths. But two of the best I've seen would be...
Noroi A really good film, period, and probably the best example of J-Horror FF. A slow burn, sure, but super creepy.
Lake MungoA mockumentery/ff hybrid that does away with jump scares, focusing more on psychological dread. Again, a slow burn, but very good.
Some other worthwhile FF movies, of varying quality, would be...
The Last ExorcismThe BayThe SacramentPhoenix ForgottenWillow CreekSkinwalker RanchThere also
V/H/S, and it's sequels, that contain some effective segments (
Amateur Night from the first entry,
Safe Haven from the second), despite being a little lackluster overall.