Hmm....*twitches whiskers in agitation*
Tweaking can be so frustrating in the early stages! I like some of the changes but now there's a whole new set of problems. My
impressions, and first impressions only mind you, are that now the breastcollar is a hair too low, the cart is a little too low and a little too far back from the horse somehow. Yes, I know, you only did what we told you too!
But this is where it starts getting frustrating instead of fun because you start having to play around with smaller variables to see what effect they have on the whole.
You've been providing great photos to work with and that helps a lot but be aware that some of those moving shots are being taken at an angle that distorts the look of the cart. Can you get your hubby to kneel down or stand further back and use a zoom? It would also help if he was even with the horse's midsection or hip rather than your position in the cart as the current angle is elongating the appearance of the rig and making it hard to judge the true balance and scale. The closeups of the horse are fine, I'm only referring to the pictures that have you and the cart in them as well.
If the shafts aren't floating then we've still got a balance issue, no question about it. For many carts (including my Bellcrown with only me in it) floating seems to be an unattainable dream and it's often better to have a few pounds in the tugs as then the shafts don't slap up and down. The Smart Cart however floats like a dream given a chance and I think you should shoot for that.
Start by holding the shafts at the height we want them at; currently that would be with the top of the loop at about the height of the top of the breastcollar. (It might help to measure the distance to the ground from that position so you can hold the shafts at the right height without involving the horse.) Adjust the cart so that when the shafts are at that height the seat is level and not tipped back. From there, make sure the seat is the right height from the floorboards for your leg length and that you can brace your feet properly against the sloped part of the floor.
The problem for me is that while I've been around a ton of Smart Carts and taken lots of pictures of them, I've never adjusted one myself so I'm not sure exactly what parts move and in what direction. I just know that many of them do!
Hopefully someone like the Whitemans that have fitted these carts to many different horses will pop on and give some recommendations for specific adjustments. I just know you need the factors above to be correct, then you need to tweak things until the shafts float at that height with your weight comfortably positioned in the cart.
I'm really not sure what to do with the breeching at this point. The shafts are too low to do the trick of wrapping it back under the shaft instead of back over, it'll look messy to let the traces ride above holdback straps, and tweaking the angle of draft will cause its own problems unless you were to buy a Freedom Collar and the lowered draft assembly for the Smart Cart and completely change things. I personally prefer that setup, but it would be an expensive "tweak!"
I'll go review my pictures of correct Smart Cart setups and see if anything jumps out at me. I can't post them without the owners' permission (Whitemans, Clickmini, and a couple of others) but I can look at them for ideas.
Keep up the balancing efforts and lets see what some other folks have to say!
Leia