Suspension Setup | Shockcraft

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Trying to diagnose in a thread can be pretty difficult, but my first impression based from your description is you've got too much progression in the fork, and not enough in the shock. I would find someone who knows what they're doing (I'm being presumptive in that you're not familiar with suspension tuning) to get in and see what type of volume spacer/tokens you're set up with.

Setting your sag is great for bump sensitivity, but after that your dealing with the spring rate and how fast it ramps up. My bet is you need a larger volume spacer in the shock, and at least one fewer tokens in your fork.

 

Fox's tuning guide is at least somewhat famous for recommending low-ish pressure in the shock and high-ish in the fork, especially for the DPX2.

But if you've got the correct sag, and you're bottoming the back end, you might need a bigger volume reducer. Tons of info out on the web -- and this forum. Grab a cup of coffee and start the searches!

 

Take the shock pump out with you, and ride separate segments for adjustment. This takes time, so do not rush. You didn't mention the pressure you're using neither your weight, but in general it goes as this:

Flowy stuff=low speed compression. If the suspension is bottoming out, increase air pressure and increase compression, just a little bit at a time. Repeat to satisfaction. If you're happy but bike is still close to bottoming out, consider adding a volume spacer.
Jumps=high speed compression. If your suspension is harsh, decrease HSC and decrease air pressure, again in small steps. Repeat.