You got it right.
I pretty much turn those on on every intel wireless device … but it isnt always ‘the fix’.
Next I would try disabling power management on the related iwlmvm module.
So same thing, different file.
/etc/modprobe.d/iwlmvm.conf
options iwlmvm power_scheme=1
Reboot.
Check performance (with both files).
If not improved then remove the first file
sudo rm /etc/modprobe.d/iwlwifi.conf
Reboot.
Check performance (with only the powersave one now).
There are a few other common options, but mostly ones I consider undesirable such as disabling 802.11n.
EDIT
Your device is supposed to be too new to be affected by bluetooth interaction but it may be worth trying.
/etc/modprobe.d/iwlbt.conf
options iwlwifi bt_coex_active=0
(or try in conjunction with others as above)