Surely your IP advised you of all of the options that were available to you, and you chose the one you felt better suited your circumstnaces? Or were you told that you should do an IVA?
If you feel that they payments have been set too high, you can appeal the IP's decision directly with him/her or ultimately at Court, but you will need to give good reason why and produce documentary evidence of your income and expenditure as necessary.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
http://www.melaniegiles.com/ivaEnquiry.asp
See customer feedback at:
http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp