Amazon Listing not Refreshing, Customization Template not Uploading, and Teapplix not receiving Custom Information

Okay so there are a couple things here I’d like help on.

FIRST ISSUE

My company on Amazon sells custom items. We have a specific listing that is essentially our bread and butter for our company. This listing has two variation options, one being size and the other being color. We have about 450 size options and about 8 color options which means that the parent ASIN on this listing has about 3600-3800 children. This listing worked perfectly for years until about last October when the listing itself would fail to refresh when a variation is selected.
For example, if a customer selects a 24×36 black picture frame, then changes to an 8×10 gold frame, the images would fail to refresh but all the text and information on the screen would change. This has caused all sorts of issues for us as customers would order the wrong item then return and we would front the shipping costs. We tried to get Amazon on it for a while and after many… many… opened cases, we finallty got an answer being that we have too many children and there are latency issues. Which makes sense becuase quite a few of my competitors that had a similar listing set up as we did have also been making new listings to try to adapt to this (stupid) change. Our business hasn’t been doing well since whatever change Amazon made.

SECOND ISSUE

This leads us to the second issue I have. In order to adjust to this change, I created a “master” listing that essentially separated size and color as variations. So on one side you have to select the size of your item, THEN on the right side when you go to add to cart, instead there is the “Customize Now” option. This is where you’ll find my color options. In some ways this is amazing and makes things like adding new colors really simple. However, since I have about 450 sizes, and doing this manually would take FOREVER I began looking for a flat file way to do this. Luckily we found an Amazon Customization Template Flat File and I was able to input all the needed information in that while applying these options to specific SKUs and providing direct image links that apply to the originally selected size.
I found where to upload this on Amazon Seller Central. This specific upload dialogue called for the file to be saved in a Unicode .txt file. So I saved my template in that format and uploaded it. I waited for the inevitable error message and essentually I got one that claims that my image links were incorrect and not in a specific file format that they called for like PNG, JPEG, jpg. This is incorrect because I used postimages which provided me with direct links AND they’re jpg. I attmpted to host my images on AWS but honesty it’s quite complicated and I need a way to get all these images in a direct link and in bulk because of the sheer amount of children my parent listings have.
I openned a case with Amazon and am waiting to hear back on this case.

THIRD ISSUE

As you can see a lot is going on. So in the mean time while I was trying to figure out how to apply my customization options in bulk to all my child skus under that listing, I manually did a few of our most popular sizes just to have in case someone comes across our listing. Yesterday, someone did come across it and ordered an item in white. We use a shipping hub program called Teapplix that pulls all our orders across many different sales channels and puts it in one spot where we can buy shipping labels, print packing lists, and print pick lists so that we can fulfil the orders. On Teapplix by default there wasn’t an option to see the customization selection. So I enabled that but because our customization options aren’t text based but instead image based, Amazon sends Teapplix the image literally in a zip file instead of just saying “White” or “Black” or “Gold.” Also, the customization options don’t go into the pick list so we have to manually check every single one because the information A) for some reason is an image in a f*cking zip file and B) doesn’t transfer into the picklist.
So my question is do any of you have any alternative service or way to steamline this?