Ahoy i'd like to use your mod in my modpack 'Technius' over at technicpack.
+ Forge essentials have now updated to 1.4.0-beta7 and it seems they have noted, and i quote: "The ASM compatibility issues between Mixin and other mods have been resolved (with possibly the exception of Fastcraft*, add -Dfastcraft.asm.permissive to your launch args or wait for a new Fastcraft release from Player)." May want to look into it? 
<3 keep up the good work Player!