The forks on my Giant Boulder SE dive under braking, and dive when I stand up to pedal. I want to minimize the dive. I assume I turn the top adjusters (marked -P+) towards the +? I'm used to S-F adjusters for motorcycles (Soft or Firm)...what does P stand for? Preload?

Sorry I'm a total newb. just use this bike for gettin to class and whatnot, and the squishy fork is annoying.