Perhaps your expectations are a bit high?
UnforgivenII, Maybe we need a bit more information to provide useful input - - -
What is the barrel length of your .357? Only certain loads will give a lot of expansion with a shorter-than-six-inch barrel. Frankly, the brands you mention are two of the better-reputed "big name" types. When you start out with a .357-diameter bullet, any final diameter over .50 is pretty good.
What weight XTP and GD bullets have you used?
This relates to the question - -
Where do you hunt, and what size are the deer? I've hunted a lot of little Texas Hill Country whitetails that simply didn't have the body mass to allow certain loads to open up before exiting. As you are dissatisfied with the expansion, I assume your bullets are staying in the deer. Is this correct?
An extreme example of mismatched ammo-to-game would be, using a 180 JSP bullet from a four-inch barrel, on a 90 pound-on-the-hoof deer - - You really haven't much chance of expansion with this combo.
OTOH, I'd not want to use a lightly constructed 125 gr. JHP from an 8-3/8 inch barrel on a 200 pound deer - - Good chance it would end up too shallow for the desired result.
Many think the .357 is marginal for deer hunting, but your stated ranges are realistic. I've done it with a four-inch .357, and got a one-shot kill, but I wasn't impressed with the results. I went back to big bore handguns thereafter.
Best,
Johnny