first toggle the turbo hand grabber. meaning turn it on if it was off and vice versa
i would also recommend you to first run a complete maintenance on your database (vacuum analyze) and then defrag your hard disk.
i am guessing in 4 yrs you have never defragged you disk and its heavily fragmented making it lot slower.
i recommend using o&o defrag software as it is effective on postgres files. its free for 30 days.
O&O Defrag 15 Pro
20-22 hands is not too bad for a 4yr old pc though. how much ram do you have and what is your OS xp or win7.
Lastly hm and nc are two very diff programs and work very differently when parsing HH. and as you would have noticed Nc can do a lot of indepth stuff .