Agreed with Michael -- 2x2 802.11n (with a 300mbit PHY rate) is extremely unlikely to see anywhere near 200mbit. Even assuming no loss due to noise or poor SNR, wifi's TCP throughput to PHY rate ratio is 1/2-2/3 at best.
So, getting around 100/100 is probably expected. If you require higher bandwidth, you will likely require 802.11ac AP's, with 40 or even 80MHz channeling considering the clients are 2x2.
Also be aware that a lot of lower end laptops and most smartphones don't come with the most spectacular wifi cards, and they are often limited by CPU or their interconnect (PCIE or SD) and cannot exhibit the max rates of 802.11ac.
As far as seeing less than 100mbit, that seems odd. I would try some static channel assignments to make sure automatic channel switching is not resulting in dropouts. I would also troubleshoot with a 5GHz-only network to see if it's 2.4GHz that's being slow for you. Unfortunately some buildings have inherent sources of interference that prevent good data rates on 2.4GHz.