802.11 MAC counters high values

Hi,
I have a WLC 2106 with 3 APs.  Everything works and users can connect, but the throughput seem to be lower than it should (it is around 8Mbps and should be around 30-50Mbps).  And all speed and duplex has been accounted for.
I need help trying to understand the stats that I see for the 802.11 MAC counters I under the Wireless APs.on the controller.
That screenshot is attached.  I see high numbers for the following areas:
- Tx Failed Count
- RTS Failure Count
- FCS Error Count
Can someone explain what these mean and what could cause this?  Maybe these are normal and not a concern.
And if these values could result in low throughput and higher than it should latency?
Thank you very much!
-rya

any ideas please?
-rya

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