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Your answer is Track time.....

Seriously you'll reduce your lap times way more by improving your driving than attempting to tune your suspension since, as you have mentioned yourself, you aren't consistent enough to be able to fine tune it.

There is no one magic suspension setup that works for everyone, and until you are consistent enough to be able to see how the changes are affecting it, you will just be chasing your tail and potentially making susp changes that are slowing the car down.

It is the driver that provides the consistency of lap times not the susp setup.
The wrong setup with a good driver will still be consistent, just consistently x secs slower than ideal.

I'm not aware of any current businesses that cater directly to race car suspension setup who actually come to the track. Though if you came to a clubday I'm sure you could get a more experienced clubracer to take you around the track and give advice on how they think the car handles.

When I was first setting up my car I made myself a line around the circuit, drew myself a map to log it and picked a few constants. At wakefield I would have a set number of carlengths from distance signs for braking, what gear and approximate speed. People used to look at me funny when I could tell them exactly what speed I was doing when I turned into every corner at the clubdays... however from there I got my laptimes consistent. Then I'd pick 1-2 corners each lap and increase speed or brake point in some way and watch how the car behaved. If it understeered a little, I might only adjust the damper to slightly softer in the front, if it was a lot I might do something more drastic like a swaybar adjustment.

If you list all the rest of your suspension (sway bar size, springrates etc) someone might be able to give you a baseline to start tuning your car from which is more stable.