Help about Sword of Night and Flame Build

Hello. I've been playing my second run( NG). In my first run i used melee/bleed build and it was a blind run in general. However in my second run i wanted to use some kind of spell and magic so i did sword of night and flame build. My expectation was that it was going to be an easy run compared to my first run but no. It was nearly equal to my first run in hardness. I have heard that people could easily kill bosses with these kind of builds but no. In my first playthrough i could easily kill Rennela and Godrick in two tries but in this run they took around 10 tries. Margit and Radahn were no easier neither. What am i doing wrong? Here is my build:

https://preview.redd.it/vg8iyb71443e1.png?width=1911&format=png&auto=webp&s=252bcf6abf75efc830b1229e19e661cddfc1966e

https://preview.redd.it/jmzt9e77443e1.png?width=1920&format=png&auto=webp&s=8b93bd4adf2dcaab6a503770338cdfe16f60597e

Sword is +5 and seal is +4