Gsat @ 83 E? I too thought that dish tv dish catch 100 - 95 = 5 degree channels but after read here posts. I realize that dish tv little moved to 93.5 E to catch DDD+ means difference between 95 & 100 is more than 5 degree.
& yes oval dish needed. I think oval dish aim was catching 93.5 + 95 & thats why its horizontal stretched . My suggestion will use real oval shaped dish tv dish.
Due to writing this post, I realize other point. That is you need to adjust monoblock direction but set your dish to 88 E accurately. Then move up & down the monoblock & try to find signal available or not. Extra lnbf direction will center - right.