Install a volt gauge so you can see it while driving. If it maintains 14.5v while driving, the alternator is keeping up with demand. If it's below that, the alt is not keeping up.

If you're getting 14.9v at the battery, I bet you have some voltage drops equaling 0.4v between the battery and the blue wire at the voltage regulator.

You can measure the voltage between the battery + terminal and the blue wire at the alt. It should be 0.00v. Any higher indicates a voltage drop through the harness, which is bad.

I eventually installed a relay to bypass all the voltage drops through the bulkhead/ignition switch to finally get 14.5v at the battery.