What do you mean by expand them with scrapebox?
Well if scrapejet brings in say 1000 links. Say 500 of them are unique domains. Then you load those 500 unique domains into scrapebox, and use the internal link extractor addon to suck out all the internal pages, or use the site:domain.com on google to pull internal pages, or both. I use site: then use the link extractor addon for internal from the goog results. Then run them thru the link extractor addon a few times.
From there you have a lot of other urls on those original domains scrapejet brought in for you. So you can either post to them all, pr check them and sort them, obl check them and sort them whatever you want.
Because scrapejet brings in its pages from google, but there might be other pages then what you get initially by scrapejet that are higher pr or have lower obl or both or if you just want more then 1 or 2 links from that domain. It depends on what your after, but you can get more out of your initial list with scrapejet. Scrapebox just gives you more granular control over how to use those domains in your favor.
I think you're a good guy loopline so I will just respectfully disagree with you. No one - neither you, nor I , nor anyone else - can say they truly know 100% what Penguin is ALL about. And it's the old nofollow/******** debate once again which has been done a million times, you know what camp I am in. Google doesn't credit links from WP specifically, just the comment links from sites on that CMS. Nowhere did I say that Google doesn't spread misinformation. I think we both agree that Google is the master of bullshit mongering. A couple years ago, yes, I also experienced the same results as you, ranking with Scrapebox alone, but nowadays I have actually damaged my sites by using SB alone on them.
I would agree, no one can say for sure what penguin was all about. I just know I took sites that got hit and recovered and increased their rank after penguin, as well as I am ranking new sites. So for me thats enough to say that I know enough of what Not to do and what I can get away with.
Haha, the nofollow/******** debate. Well you know my side as well.

But I frankly don't care about sides. If I am wrong Im wrong, I care about results.
Ha, we agree on the fact google is the enemy, glad to be on your side on that, as thats the most important topic.
As for hurting your sites, Id say spread out your link profile. I mean if it were as easy as bombing a site with a half million blog comments to hurt the site, well then lots of people would be doing it. I have actually tested this, with permission on established sites, since penguin. I nailed a site that has a excellent link profile. Not like microsoft.com but a car parts site that was ranked by another seo friend. After the onslaught of links, the sites rankings had small improvements, not loss at all. Good site profile + spam = win Bad site profile + spam = lose
Xrumer for the win bro. Wikis + guestbooks + blogs + forum profiles = better than that. lol
Apples vs Oranges mate. No one said Scrapejet was better then Xrumer, its not meant to be. Its completely different, Xrumer is certainly NOT push button simple like SJ, I have both and use both. Yeah, Xrumer can build more links quicker then scrapejet, but its $600 vs $50 too.