N Inspector & Antisrophic Filtering

I use Antistrophic Filtering Mode: ANISO_MODE_SELECTOR_COND and setting too: 16X....FSX looks ok, but not as great. It kinda blurs things a little, so I changed the Filtering Mode too : User Defined/Off and kept the setting at 16X and WOW FSX never look clearer and I love it.Here the catchl when I fly at higher altitude with AF in User/Defined, even at lower settings like 2x or 4x my FPS drop ALOT like from 80F to 22FPS looking over the water, when I look out over the water at high altitude when Im at say 23.000 feet, but if I look over land with the same AF Setting and AF Mode in User Defined my FPS jump up to the 80sDoes anyone know what is going on and if I can fix this somehow. I've tried using lower water settings and not using REX ect ect but nothing seems to work, I like to keep this setting on as my land/water looks amazing!Your thoughts.