When we built our home, the back half of the yard (about 100 feet) was not replanted. It was high weeds and I have been maintaining it. It is very thick and whenever I mow, I have to rake back there. I see it has a lot of thatch, what would work best? The rest of the yard is thinner, due to me planting grass. Should I thatch the whole thing? What about these pull behind cheap things? Or shoudl I rent one?