supermanu - 8:36 am on Sep 15, 2009 (gmt 0)

Dear webmasterworld members,

We are about to switch our website to an entire new technology:

- ASP => PHP
- New URLs (based on mod rewrite)
- New title metatag
- New title H1
- Updated content

We are planning to do a 301 redirection for our entire website and we do think have all necessary information for this.

However, we did the same method twice and different results occurred:

first website: No or few drops for our main keywords
Second website: BIG DROP for our main keywords, a real catastrophe in term of result

I do not know why it works on first and not the second method and I cannot figure that out.
After reading information about the method, I figure out that all was not doing as an ideal world:

"You will see a temporary drop in the rankings, because Google has to do back-end processing in order to pass the old URLs' PageRank to the new URLs when it finds the 301 redirects. It can take anywhere from a few days to several months for everything to return to normal, depending on the PageRank of the original URL, and depending on how often your URLs are spidered. " as jdMorgan said on [webmasterworld.com...]

The third website represent roughly 95% of our activity and I want to make sure that no mistake is done.
We are satisfied with current ranking and we of course do not want to have a massive drop in term of inquiries

What would you recommend?

Option 1: use same URL (no 301) and keep the content as closed to as it was before (keyword density same, title H1, title metatag same)
Option 2: 301 but keep the content as closed to as it was before (keyword density same, title H1, title metatag same)
Option 3: go for full redirection and change of content

Any other option?

I thank you very much in advance for your help