Sounds good.
for troubleshooting purposes, these questions may help stir you in the right direction:
- Is your wireless client connected to the 2.4 or the 5Ghz radio? 5Ghz should have less trouble delivering MAX throughput.
- Is "Smart Connect" enabled? if so, disable it and run a check on the individual radios.
- Have you checked if there are other closed WiFi networks transmitting on the same channel?
- Are the LAN ports of the Modem Gigabit?
just pure curiosity, with the prior speeds, was the bandwidth measurements matched your speeds when testing over Wireless?