There are three numbers you're manipulating there over your various tests, but they're all doing the same thing.

The Noise produces a value from 0 to max (.8 in your last one)
The Specular multiplies that with another number (.02).
Then the Add node is multiplying that with another number (.4 in your last one.)

There's no point in trying numbers in different combinations - no matter which one you change in that node setup, it's doing the same thing - changing the overall maximum value.

So .8 * .02 * .4 = .0064 <--- that is your effective maximum.

You can change that to 1 * .02 * .32 and you get the exact same results = .0064
You can change that to .5 * .02 * .64 and you get the exact same results. = .0064

 

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)