Guidance on Recognizing Professional Services Revenue on a Monthly Basis?

The short version of my issue is that I would like to modify our revenue recognition policy for our professional services so that we can recognize on a monthly basis based on the number of hours delivered, versus at the end of the delivery period when we receive a signed Proof of Completion “POC” from the customer. Our company, which I recently joined, is a privately held software company that also sells professional services on a stand-alone, hourly basis, completely separate from the software (separate order & invoice). Do you have experience with this that you could point me to specific guidance that would support recognizing on a monthly basis? I thought ASC606-10-55-18 was relevant though doesn’t go into effect until 2016. Below are additional details about out process. Our standard professional services work order contains a clause that states “Customer will sign a written Proof-of-Completion to certify the delivery of the services”. The company’s revenue recognition policy for the services has been to defer the entire amount on the order until the Proof-of-Completion (POC) form has been returned by the Customer. The amount is then recognized in full in the month the POC is received. Our services are frequently sold in large hourly buckets to be delivered in quarterly or even 12 month periods (e.g. 1,500 hours to be delivered from 4/1/15 to 3/31/16). The services orders are invoiced at different times depending on the customer, with some invoiced in advance, some at milestones, and some at the end of the delivery period. The associated expense to deliver the services is not deferred. It is somewhat buried when the services are provided by existing staff, but becomes more apparent when the services are provided by a 3rd party vendor. We are audited by a 2nd tier firm and the services revenue and expenses are material. From my perspective, there are two problems: 1) the revenue and expense are not being matched, and 2) there is large variability in the services revenue as the revenue for a large project is not recognized until fully delivered and the POC is received back from the customer. It is hard to forecast services revenue given that a customer may take a couple months to return the POC at the end of the delivery period. The internal accounting team is agreed (I think) that we need to modify our process to match the revenue and the expense. I would much prefer, though, to recognize the revenue on a monthly basis according to the number of hours performed, versus deferring both the revenue and expense until the POC is received. When I told the team that I would like to recognize the revenue as delivered over the life of the contract, they said that we can’t do that given the POC clause in our contract. They also said that the auditors wouldn’t sign off on it. As I‘m not a technical expert on revenue rec, any information you can provide is greatly appreciated!