I spent, like, half an hour setting the gaps on my Seydel Blues Soloist Pro today.  The harp plays a lot better.  But I couldn’t get it set up to both honk loudly in the middle register and overblow easily in the same place.  And it was half an hour. Alas.

It’s easier to buy harps off the shelf that work the way you like. That $80 model 1847 Seydel is looking more attractive all the time.