As you mentioned some struggles with Quickbooks you could spend a few dollars for a bookkeeper/CPA (with real estate experience) to help get your numbers in order.After assessing the performance of each property, you should be able to then identify areas for improvement of cash flow for each investment.

I just adopted cloud-based book keeping. 

Any other bonuses like bookkeeping or quick books training is a plus but not required.

Payroll, bookkeeping, etc can mostly be done remotely.Here is a great list of questions to ask a potential accountant:http://www.biggerpockets.com/forums/51/topics/70447-questions-to-ask-a-cpaAlso check out the www.NAEA.org page in your search.

Bookkeeping, tax returns, state filings, collections and some other tasks.

(ie. you charge e.g. maintenance fee, bookkeeping fee etc.)The benefit of this is that it is much easier to come up with a concrete number (e.g. looks at other service provider for prices).  

Income/Loss statements for tax purposes take less than a min at the end of the year provided you have performed your book keeping/accounting correctly.

Has anyone used Propertytracker.com for book keeping services ? 

I tried TenantCloud and found the bookkeeping part to be very hard to use and doesn't give me the reports I need in a usable way.

Book keeping for one unit 12hrs.