Just an FYI:
Modpack v6.3.0.1 #06 ported into 6.4.0 without any issue. I just needed to rename the subfolder in Res_Mods.
I'm running the following elements without trouble:
YAZM, Compass Elements #1, Golden Premium Consumables Icons, Minimap by Autospy, Lights of New York Port, Black Sea Anniversary Port, Jaws Theme #1 Torp Warning Voice, Texture Based Ambient Occlusion, Gun Calibers in Inches, Fog Remover, Anti-Glare (Sunglasses), Better Compact Icons, Extended Tech Tree, Training Room Enabler, Clear Vision, Ship Movement Indicator, Port In Navy Blue Color, and Replay Enabled.
One quirk I noticed today (and I believe is independent of the modpack) was that my gunfire sounds were much quieter. Easily fixed by ramping up the volume in Settings.