Will domains work better ?

After my dissapointmant when my 2 niches jumpsoles and polar s-725 were dropped into sandbox I decided to try with domain. My problem might have been getting to many links, too fast I got 3400+ backlinks for jumpsoles.poglej.net in a week this might "warn" google to put my site in sandbox. I have now decided to get www.jumpsoles.info and www.learn-juggling.info and only try to get PR4+ backlinks I hope it will work good for me and of course expect my comments ;)