For my fellow Indy's who've been frustrated by this same issue on their Wested jackets, I want to share a solution I came up with that ended up working beautifully.
Rather than having a tailor apply a single, narrow band of elastic - I did some digging on Amazon and found this incredibly strong elastic that comes in a 7-7/8" roll. This allowed me to essentially create an interior panel made entirely out of elastic so that the pleats could be pulled uniformly along their length - not just at the stress-point where a normal 1-2" band would be sewn. Plus, you don't feel the elastic beneath the lining like you do with a smaller band.
Here is what my jacket looked like before the alteration...

Here is the elastic I used...

And here is how the action pleats look after the modification...





If any of you are looking to try this out on your own, the elastic can be found on Amazon here: https://smile.amazon.com/gp/product/B01 ... UTF8&psc=1" onclick="window.open(this.href);return false;
Here's a short video demonstrating the strength of the elastic and how the action pleats immediately pull back into position after stretching...
https://youtu.be/fuC4vWXL_jc