More important than gas port location is gas port diameter.
If your AR is over gassed, it's over gassed and a heavier buffer will not fix it.
If you're running a carbine RE, you should be running an H2 buffer. Better is the A5 RE with an A5H2 buffer and Sprinco green spring.
Once you got the right buffer (H2 or A5H2) you tune gas flow to match. This is done in one of three ways. Correct gas port diameter. Adjustable gas block from SLR. Or a Custom Tune Micro Port kit from BRT.
The easiest method for the shooter is to use the SLR AGB. Easiest way to tune the AGB is to use the lock back check. Place a single round in the magazine and load & fire the rifle. Keep closing the gas block until the rifle ejects but does not lock back. Then, open the gas block one click and verify it ejects and locks back. Open one more click to allow for heavy fouling and extreme changes in environmental conditions.