Modded Skyrim Performance (FPS)

Hello, I am curious if my modded Skyrim performance is normal, in most areas, I get between 40-45 areas, but in most of the open areas, I get 56-60..Occasionally the game will drop to 5 fps for about 10 seconds or so. I am on an i5 6600k, r9 390 8GB GPU, and 16 GB DDR4 RAM. The main graphical mods I am using are: Static Mesh Improvement Mod, Skyrim HD 2K, Skyrim Flora Overhaul, Verdant, Skyrim 2016 by Pfuscher 1K-2K, HD Enhanced Terrain PRO Blended Version, Realistic Water Two, aMidianBorn Landscape 2K. I have more smaller graphical mods, but those are the main big ones. Also, I have all of the Skyrim setting on High, AA and Anisotropic Filtering are off. I am running the game at 1080p. I have the ENB files installed, but I don't have an ENB preset. I also have the SKSE Memory Patch. Just in case you need to know, I am using Optimized Vanilla Textures, and it is at a lower priority in Mod Organizer so other mods can override it. I am not currently using the High Res DLC.

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