What exactly does AWARD WORK L-- vs H++ do if you are only bidding 3 lines. Ex 1) AVOID ALL NIGHTERS 2) AVOID BWI 3) AWARD WORK L--?

Basically, I got 6 trips this month (2 and 3 days) for 71 hours. Last year around this time I got 4 easy 3 day trips. Does the L-- or H++ correlate to being awarding more vs less work?

Thanks. Hope that question made sense. Basically I want to work less than the high time lines I've been getting *this month aside)