The FX helmet is HUGE compared to a real screen accurate helmet (or screen accurate replica; ie ATA, Scootch, AP, TE, TE2, etc). That, combined with a lot of other details, are why FX helmets are now considered junk. The increasing availability of very accurate helmets and armor has relegated FX stuff to the trash heap. A full FX armor kit used to cost around $600 with a helmet. For that price you sacrificed accuracy and detail for affordability. Nowadays you can get a set of VERY accurate armor with a helmet for just a little bit more, and you have your choice of makers to deal with.
Another thing you may not realize (from your post above) is that the original helmets are NOT AT ALL symetrical. Things are crooked and wonky looking because the original molds from the movies were hand sculpted. Accurate reproduction helmets carry all the same traits because they are ACCURATE. Scootch's helmets are considered to be some of the best available, so I highly doubt there was a problem with the product (especially if it was a finished helmet). It may just be that you have a problem with the way you're perceiving the product.
The two helmets you have cannot be compared to a CAP-W (Scootch) helmet. You're basically trying to compare a Pontiac Aztec to a Bugati Veyron. As everyone else has stated in here and in other threads that you've posted, do some research to learn about stormtrooper helmets BEFORE you buy. Everything you need to know about stormtrooper helmets can be found here and here. Do your research before you spend anymore money, and hopefully if/when your Scootch helmet comes back to you, you'll be better equipped to appreciate it.