That model seems to be a re-branded MTD designed mower. Same as a lot of the Craftsman, Ariens, Husky, and about 5 other brands. A brief search on the internet will show you that these are all famous for not having a lot of deck lift. And what little there is, is not very accurate. My BIL's Craftsman has 6 positions on the lever, but the most we can really get is 3. YouTube is full of videos with adjustment ideas, up to and including bending the operator lever. Watch about 6 and you'll catch the recurring mention of what I'm telling you.
I'm not knocking the mower, I'm only saying this so that you know not to expect wonders. Start by playing with the front deck hanger adjustment.
Hope this helps.