Probably nothing wrong with your charging system
cruising at 5300 rpm, showing 13.3 volts and 14 amps.Can someone help me understand the +14 charging amps?
Unlike electromagnet alternators, [used in cars & trucks] you can not throttle the output of a permanent magnet alternator [more correctly called a magneto]. The faster a permanent magnet alternator spins, the more amps it puts out.
On an electromagnet alternator, you can throttle the output, by lowering the amount of current sent into the alternator's rotor [the electromagnet] Less current means a weaker magnet, which in turn means lower output.
Since you can not control the strength of the magnets in a permanent magnet alternator, the voltage regulator simply absorbs the excess current [amps] to keep the voltage within the correct range. In your case, somewhere between 13.3 and 15.0 volts. The Zener diodes used for voltage control on old [1960s - 1970s] British motorcycles work the same way. Now days, the Zener diode is replaced with a solid state voltage control unit. These devices act as an additional load [like a light bulb] to absorb the excess output. Without this, the voltage would sky rocket beyond 15 volts at high engine RPM.
You could then kiss your expensive avionics and battery goodbye. Many modern avionics contain internal over voltage protection. But there are limits to that protection
Since you are showing 13.3 volts, it means that your battery is fully charged. If you battery needed to be charged, the voltage would be higher.
The other possibility is that your voltage regulator is absorbing to much current, assuming that your battery is not at or near a full charge. If your battery's "at rest" [engine off & no drain on the battery] voltage is between 12.8 & 13.2 volts, it is at or near full charge.
So a running voltage reading of 13.3 volts with a fully charged battery would be normal operation. Your voltage regulator has reduced the charging voltage so that the alternator does not over charge a fully charged battery. Batteries are ruined by over charging. Classic signs of a battery ruined by over charging, are bulging side walls on the battery.
https://alternatorparts.com/what-are-permanent-magnet-alternators-faq.html
https://circuitdigest.com/tutorial/zener-diode-types-applications-and-operational-principle/