Wireless air speed is different to actual throughput. E.g you should in theory be able to achieve 300mbs on wireless N but its impossible.
It all depends on distance from the AP, encyption used, obstructions, radio interference, channel width, which version of AC, the laptop wireless chip, the AP wireless antennas gain, etc etc.
I would advise sitting in the same room as the AP, turning off encryption, then choosing the best wireless channel and channel width and work from there.