Renaming file name in a webpage and de-indexing problem with Google

Hi
I have few webpages that i faced with a big problem. there are 4 webpage and most important webpages in my website. I hit by penguin for these 4 webpages and my ranking for these pages went down. But I had not received a message from GWT. The reason for penguin hit was lots of article links to these 4 webpages.
I tried to remove these bad back links but i noticed it is very time consuming process. So i changed my file name in these for webpages so i though non of these bad link can direct to these pages so i can create new high quality inbound links.
for example i did like this
www.mysite.com/industrial-inspection.html (removed)
www.mysite/industrial_inspection.html (replaced)
in fact i change dash line to underline
what happened ?
these renamed webpages indexed in the google and i was in third and forth pages in Google search(in two weeks), my scenario was to make high quality link and bring them to first or second page but after 2 weeks all 4 renamed webpages de-indexed from Google.
These 4 pages are more important pages in my website. When you search their keywords, the webpages do not populated even in 15th pages of Google.
Do you think this is manual action by Google? is this ban is for short period of time or they will never will be indexed?
why Google de-indexed these 4 webpages?
i have almost 850 visitors per day so these pages are in my top left nav bar column and each of these pages are visited hundreds times per day (it means when searchers fall in my site with other keywords also visits these pages)

what is you recommendation to me to do something for indexing for these 4 pages? it is almost 2 months i am waiting for these pages to be indexed

thanks for your time and attention
bob

Submitting Sites to 80+ Search Engines at once

Hey there!

this is my first ever post in a forum so i dont know if i break some rules :P

So i have a site i wanna submit it to 80+ search engines at once? just want to make sure i am not doing anything wrong is this spammy :P btw google doesnt know about it right that your site is somewhere submitted but u make tons of backlinks from the search engines

So is it ok to submit my new site to 80+ search engine all accross the web ?

Regards,

Bashoo Zmmarraii

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