I need a email invitation letter written for a survey on Innovation

Kind of letter: Business
Num. of words: 400
Topic: email invitation to participate in a survey
Tone: Formal/Professional
Outline & Structure: We are looking for great email invitations to get participants in a survey on Innovation
Background
We are running a study on the drivers of Innovation. We need companies to participate in an innovation audit survey to do this research. The survey takes 30-45 minutes to complete. Here is link to the survey:
http://www.leuven-research.be/limesurvey/index.php?sid=67692&lang=en
In exchange for their participation participants received a FREE innovation audit report
Sample report : https://www.dropbox.com/s/tyyqeu8mi4t7llz/Sample%20%20Solvay%20Innovation%20Audit.doc

Results to date: We have developed several different emails and results have been poor. (Samples attached)
Invites Sent 1800
Full replies 55 3.1%
Partial replies 40 2.2%

There is no real difference between the emails we tested. This is not good enough. In past research we got a 6% completion rate and partial replies were less than 10% of the total.

Work to be done
1/. Read the current invitations (these will be sent to the people selected for this work)
2/. Look at a sample report
3/. Write an invitation email that you think will work better than our current email invitation

Methods
We will hire 4 writers and run a parallel test

Payments
Please provide an offer for writing one email invitation
We will pay the writer that creates an email with the highest net response rate a bonus of $100 (if higher than our current) and provide a written recommendation saying you wrote the best email.
Extra notes: We are looking for great email invitations to get participants in a survey on Innovation
Background
We are running a study on the drivers of Innovation. We need companies to participate in an innovation audit survey to do this research. The survey takes 30-45 minutes to complete. Here is link to the survey:
http://www.leuven-research.be/limesurvey/index.php?sid=67692&lang=en
In exchange for their participation participants received a FREE innovation audit report
Sample report : https://www.dropbox.com/s/tyyqeu8mi4t7llz/Sample%20%20Solvay%20Innovation%20Audit.doc

Results to date: We have developed several different emails and results have been poor. (Samples attached)
Invites Sent 1800
Full replies 55 3.1%
Partial replies 40 2.2%

There is no real difference between the emails we tested. This is not good enough. In past research we got a 6% completion rate and partial replies were less than 10% of the total.

Work to be done
1/. Read the current invitations (these will be sent to the people selected for this work)
2/. Look at a sample report
3/. Write an invitation email that you think will work better than our current email invitation

Methods
We will hire 4 writers and run a parallel test

Payments
Please provide an offer for writing one email invitation
We will pay the writer that creates an email with the highest net response rate a bonus of $100 (if higher than our current) and provide a written recommendation saying you wrote the best email.