You might think about going about this in stages and learning a little something about suspension tuning ...
Start with the springs. Get the PS fork springs. They will make a difference. Ideally, you would want to set the spacers so the front forks sag around a quarter inch with just the bike's weight on the tires. Then play with different fork oil weights. Try 5W, 7W, 10W, 12W (a 50/50 mix of 5W & 7W) and 15W. As you increase the weight you will feel the dampening in the forks slowing down. At your weight I think you'll find the 7W be a nice compromise. You need to get several 100 miles under your belt over varied terrain to get a good feel for the type of dampening each step in W provides.
At your weight, this may stiffen things enough to fill your needs. If not, add the Race Tech valves and repeat the test with different oil weights/pre load settings on the valve's springs and the oil height. The last thing to do, when the OEM shock finally blows, and it will if you ride hard, it costs over $700 and you can get a Works Performance unit for less than that.
Once you have the dampening figured out add the fork brace. In the technical stuff you will appreciate it. It makes a significant difference in how true the front end tracks.
When the going gets weird, the weird turn pro