Looks like you're stretched. If you want to ride low, there are always consequences. If you don't want to get a new spring to compensate for your stretch and weight, then the only thing you can do is crank down the preload on the stock spring. Keep in mind that cranking down the preload will raise the bike a little bit. I would start with cranking the rings down a few turns and seeing how that works out. If it still feels soft, then adjust it down a little bit more. You may have to raise the links a little too. It all depends. If you have threaded adjustable links, you can adjust those just a little bit. If you've got the 3 hole style, you'll have to do most of your adjustments in the preload. You can also turn up the compression on the shock to help cushion the bike on bumps etc.