Hi Dobbin and welcome to the forum
Now that your creditors meeting has passed, the creditors who did not vote are bound by the decisions of those that did, so they cannot now say that they do not want to join in.
If you do get the payrise, then your IP will increase your payments to a comfortable level, which may mean that you will be able to pay off the debts at an earlier stage, although this can only happen if you pay the creditors in full as well as the costs of the arrangement.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
For further details contact me at
http://www.melaniegiles.com and view my IVA blog at:
http://melaniegiles.blogs.iva.co.uk