I am having a similar experience with my short game. Last Friday I had an absolute howler with my short game. in a 12 hole competition. I duffed/ skulled at least 10 chips & short pitches. I was really annoyed and considering giving up. I played sunday and I had an 87 (v good for me). That included 5 duffed chips and a sh**k.
I took some short game lessons a year ago with a local pro, and he definitely helped, but of course since then I have been back on the internet looking at various chipping pitching instructional videos, have a mishmash of different setups, and I am now worse than ever.
I made up my mind on Sunday that what I am going to do is go back to what the pro taught me last year (I have some videos) and work on it and nothing else. I am staying away from any web instructional videos, and intend to groove the process and swing that he showed me. I am going to give it to the end of the summer and see where it takes me
My advice would be find a process and style that works for you practice it and stick with it. An old teacher years ago used to say to us "repetition penetrates the dullest of minds" I think that doubly applies in golf
