I have same settings as the link you provided.
On Adapter I have:
802.11n channel width for band 2.4: Auto
802.11n channel width for band 5.2: Auto
HT Mode: VHT <--- have this which is same as 802.11n mode. Differs from earlier Centrino adapters.
Fat channel intolerant: Disabled
Roaming aggressiveness: Medium
Transmit power: Highest
Wireless Mode: 802.11a/b/g
Throughput Enhancement <-- not shown in 7260 adapter advanced settings because adapter differs from earlier Centrino adapters
On Router I have same settings:
| Auto channel scan | Enable |
| 802.11 mode | Use 802.11n only |
| Channel width | 40MHz |
The router is not trying or connecting to other access points.
The drivers I installed are Intel Generic and not OEM from manufacturer. I downloaded these drivers from the following link: