It would be better safe than sorry to move it. Chances are that if it is staying wet enough that you can squeeze water out of the soil it is too wet. If anything raise the entire rootball off the ground and make a mound of topsoil or a well draining mix. This is usually what we have to do here as we have very bad clay soil.

I'd suggest the same thing. A couple of weeks in the ground is not a big deal at this time of year and lifting the tree is a good idea. Soil that stays wet for too long is just asking for problems with a Japanese maple. Did you test your drainage before planting? Do you have a heavy or clay soil? If working with a heavy soil or with poor drainage issues, it is always advisable to plant high. Dig a very wide but shallow planting hole 2-3 times the diameter of the root ball, like a wide dished saucer. Place the rootball in the hole so that 3-4 inches of the top of the rootball are above grade. Use your backfill to stablize and apply mulch to cover just to the top of the rootball (not over). What you will have is a mini berm or raised planting.

It is also possible that the amendments you used are retaining too much moisture. It is no longer recommended to amend individual planting holes, for much the same reason you are seeing - different soil structures in juxtaposition can retain excessive amounts of moisture, essentially creating a mini bath tub. If amending is advised, it is far better to amend an entire planting area rather than individual planting holes. If this is not possible, save the amendments for a mulch or top dressing. Remember that what you remove from the planting hole is what goes back in - unamended.

Thank you so much, mattlwfowler and gardengal48. I'll take your advice and get out my shovel....