Mesh networking problems

I inherited a problem with an existing Mesh network in a small RV park (100 spaces ). The previous installer deployed 3 of the A42 Open Mesh AP’s (any buddy know if these are directional? they look directional) but they are getting a lot of loss through the network. I am seeing about 45% signal standing under/ near the antenna, from the source (Hughes ) . I turned the power up and saw a jump in speed from about 4 Gbps to about 14 . this is good but still laggy and varies a lot from the 36 Gbps at the modem. I am in need of help on this one. New system?