Chiming in on this with hopes it will not be taken the wrong way.
It's not so much that the shirts are the problem as there is a problem with selling the natural characteristic that come WITH the technology.
Full Coverage t-shirts have been around for quite a while now and the market every year seems to get a little bit bigger. With that stated, most people, that contact us, understand that fully imaged shirts on pre-fabricated shirts will have some voids in key areas that are just about unavoidable (Pun Intended

)
We have been in the market with these shirts about 8 years (total business 12+) and 100% of our clients expect the voids. 50% desire them! (that's another story)
The boom in dye sublimated women's apparel with large voids throughout the imaged dress, skirt, etc for the last couple of years actually did everyone in the full coverage dye sub arena a BIG favor. It put dye sub in an international spotlight. We marketed that like CRAZY!
It is my suggestion that you not try to figure out a way to make a bulldozer into a dump truck and then get upset when the industry doesn't make a conversion kit.
Give your customers options. We sell tons of full coverage shirts because we tell newbie customers about the 'natural characteristics' while informing them of ALL the benefits of full coverage dye sub. If they don't desire to have those 'character benefits', we inform them of cut and sew options and those price points. What do we do after that? Nothing! We shut up and turn on the jeopardy thinking music.
We learned not to over sell a tomato to people who really desire a potato. Just work with what is the best available garment for your customer's needs and comfort, image it to the best of your ability and that is their choice take it or leave it.
I will co-sign that most shirts that image without voids are cut like a box and very uncomfortable (active people) and unflattering (as ladies say)
Again, sell the characteristics for what they are, get innovative with your designs, even get innovative with post-press finishing. Whatever you do, don't get so caught up in what isn't available....focus on what is. #BusinessWisdom
Hope this helps,
Jae