Yes the long hairs could indicate worms but the powerpac should take care of that! I love slick n easy shedding blocks and there's an inexpensive way to buy them. They are nothing but restaurant type grill cleaning blocks. I get them at a restaurant supply in a big block that I cut up and make 10 out of for 2 bucks
I use my daughter's kid detangler on manes and tails, cheaper than the stuff marketed to horse people and it works just as well! Best grooming tool there is though is lots of elbow grease! Good vigorous grooming does wonders for toning the muscles under their skin.