Hello Chris,
If I may offer a quick perspective to your current fixed pricing model:
The reason why Managed IT Services are taking such a strong hold in businesses today as opposed to the old “break/fix” model is because the clients (as the OP mentioned) can have a predictable cost for the end of the month, regardless of how many hours are spent as long as the services you are providing are a part of that agreement.
I mention this in response to what you said about “Sometimes if my time comes in under what their fixed fee is they question why…”
Well, my response to that is: Sure the client may question why they are paying X amount if you worked less hours this month than is typical, but in the occasions where, let’s say a Virus outbreak occurs where it can typically cost thousands of dollars to fix under a break/fix hourly plan, you just saved them a good chunk of that by simply charging your fixed monthly fee.
Another quick example is if the client decides to install Microsoft Office on 10 of their computers; well in my area that would cost approximately $100/computer On-Site totaling $1,000. Whereas, if the client was on a Managed Service Plan, the cost would simply be covered by their fixed monthly fee.
My point is, as Managed Service Providers we have to be able to explain to our clients these benefits they are receiving by playing out scenarios such as a Virus outbreak or a network wide software install so that they understand what they are getting with a Managed Service Provider: “Someone who is going to be there for them no matter what.” They have to see you not just as their on-call tech guy, but as their IT Department they can rely on.
It is a mutual benefit for both the client and us (the providers) and it is our job, not the clients to explain the benefits of this relationship.
I’m sorry for this long response, but I felt that I had to get this point across and I hope that it helps someone along the way.
FYI My response is in NO way a “be all, end all” absolute answer to managed services, it is simply the accumulation of my knowledge over time factored in with where I physically provide my services (Los Angeles, CA). For example, it can be a completely different scenario for someone in New York.