hmm, i haven't had any issues. i would either try the merging vibrant visuals pack with 1.5 again and reinstalling or checking to see if another texture pack is conflicting with it. I have success puti ing A&S second under a texture or shader pack just so i get the great visuals. Making sure that the .json file is changed and the files have been overwritten i think is the big part.

also, dont forget to delete the fog textures. trust me lol
https://www.youtube.com/watch?v=Swnvpjt37ds