Southern
Here's just a few tuning parameters that may help;
For a left handed archer:
If you bare shaft is hitting to the left of fletched shafts, they're weak
Right of fletched shafts they're stiff
If you lower your brace heigth, this will increase your power stroke and make the shafts act stiffer, raising you brace heigth has the opposite affect.
If I'm not mistaken the Journey is cut about 3/16" past center, so building out the plate with masking tape or whatever, might be of some value, however, those bows will increase 3 to 4 lbs. of draw weight past 28" so you are probably shooting closer to 48 or so lbs. That bow also has a cushion plunger bushing, so you can take advantage of that. Get a 5/16 x 24 bolt and screw it into the bushing, put some velcro or one of those sticky furniture pads on the head. Then you can screw it in and out, it's a cheap was to see if adjusting your centeshot helps.
Also, try bare shafting a little closer say 18 or 20 yards. This wil tell you if you're actually dealing with a form issue or not. you can only tune as good as your form is. If your form is inconsistent, your bare shaft tuning results will be inconclusive at best.
Here's some things that can be done to stiffen the arrow:
Lower your brace heigth(already talked about that)
build out your side plate, in other words, move the arrow further away from centershot
shorten the arrows(tests have shown that shortening carbon arrows 1 inch can make them act stiffer by 5.lbs. plus or minus)
Use lighter points(although I've found over the years that less than 50 grains doesn't make that much differnence)
You can also add weight to your string(cat whiskers, more strands, serving etc.)
Don't worry if your shafts are a little weak, fletching will usually correct that.
Hope this helps