Once you get to try things, and start seeing data, yes, the imagination runs wild with possibilities. I'm going to look into many things as I get the time to do them.

As for your sweet spot of viscosity question, I believe this really is a function of the Damping Ratio... and this has to do with all the other aspects of your car and suspension setup. fredswain's setup tips he describes in a detailed thread explains this damping sweetspot. First, you balance the springs, then you match the oil. Basically, this is precisely what the Damping Ratio is.

The Critical Damping is determined by your car's ride frequency (set with springs, shock motion ratio, mass of components). The Damping Ratio is a percentage of Critical Damping that your dampers provide (Damping Coefficient). Many guidelines give a range of damping ratios that usually work for typical applications. That's your "sweet spot"

I'm of the belief that the results of this work I'm doing will help drivers find this damping ratio sweet spot easier, so you don't need to rely on trial and error. To help you with finding your actual ride frequency, RC Crew Chief is an amazing modeling program where you measure your car, enter values, and it calculates your ride frequency for you. Then, with that information, you will be able to determine your damping ratio if you know what your damping coefficient is. Or, you can use the ride frequency to know what the critical damping is, then, based on some estimates for damping ratio, you can predict what "should" be the optimum viscosity oil to use with your setup based on the damping coefficient of your shock. I have been providing Bob with my damper data, and he has been developing predictive damping coefficient calculations. This means, you will be able to enter the dimensions of your shock, what piston you are using, and the viscosity of the oil, and it will tell you what your damping coefficient is. I'll tell you that his predictions are very very good at this point.