Probably the French, Spanish, and English language versions. That should give you some things to test.
Really, the sane copywriting advice is don't mess with success. That said there are some things to carefully experiment with. And I'll provide the surprise answer at the end.
-- Do I want an internet business that's 95% automated. No. I want it 100% automated. Or, alternatively 98.7% automated (A 'real' number) with a small "qualifier."
An example: If you can bag your own groceries here's how you can save 12.2% on food bills.
What this example has that all the round numbers and incredible claims don't is what Eugene Schwartz called "Belief Structure." If you've got a graph on leverage from different income sources, you credentialize it with a source, like Der Spiegel.
This has authenticity general round numbers and unbacked claims don't. And it should show up in results.
Next, the big weakness of IM, and ebooks in particular, is the ebook product itself. For example, in one forum came this post (not mine) "Just today I saw a product which shall remain nameless...it may be the best product out there. HOWEVER, it contains something like 27 DVDs. I am immediately put off by this."
This is an opportunity and insight into why people don't buy bloated ebook products. Properly done it allows you both "big product" and "quick access."
The secret all the ebook geniuses are missing. Information is only information if you can access it and put it into use. Information that isn't actionable isn't information -- it's a paperweight.
Jay Abraham is a fairly savvy information marketer. What he does is extensively cross-reference. It takes me only about thirty seconds to find a quickly digestable, actionable nugget. Even video DVDs have a "Scene Index." And guess what? In an ocean of products which are "data dumps" this is a competitive advantage. When your reader understands they can get to and act on the information you provide, you are more likely to make a sale.
But that's not the surprise answer.
The surprise answer is, even if you improve response, at 103K Euro you should be testing back end upsells for this product. The lion's share of the money you're now leaving on the table may be on the next steps in the selling process. At least, that's the place to look.
With that, you can focus on the next step beyond testimonials: Case Histories of Successful Buyers of the first product.
Related:
How to Build Value With Belief Structure