I think it does not look that bad. I would agree that it looks like a Tandy stamp which unfortuantely is not consistent. The casing of your leather is very important when stamping baskets or tri weaves since you are probably using a heavier impact tool. Just a couple of tips...Check your leather against your cheek or the back of your hand. If cool, then your doing good. If it dries out (especially with summer coming) wet the back and turn it upside down on your granite for about 30 minutes. Then check it and hit away. if you have your leather glued to something...then wringe our your sponge and just lightly go over the leather.....turn it upside down on your granite and wait about 10-15 minutes....then hit away!
As for consistancy......try holding pressure down when you are positioning your stamp and keep that pressure until you are done making the impression. it worked for me. If you hold that stamp lightly, you run the risk of it jumping and bouncing. When you have to get up off your chair and have to walk over to the other side of the room to get your stamp...well, you held it lightly.
Now to your camo border. It also looks like a Tandy tool. Because of its issue with consistancy, follow what Pete said and put in an extra secord or two to make sure that you have that position and strike it. keep some pressure on the tool downward like I mentioned above. Also, take a look at the striking surface of your stamping tools.....inspect them every once in a while because poop happens. But as I looked at your stamp again, it just looks like it may have been the tail of one of your tri weave impressions? Sorry, my eyesight is leaving me.
anyways, I hope this helps. Good luck