I set preferred to LTE, and I do have a phone on Wind to compare to, and it's much faster, it's a Nexus 5 by the way. I thought that maybe the Telus baseband would have some effect on speeds. Basically what I've noticed is that sometimes the speeds are good, comparable to the Nexus 5, but most of the time they're not great, and in case you're wondering the change happens in the same location, I'm in my room the speeds are good, the next second they're super slow, but I haven't even moved. It's weird I probably should have bought it from Wind. From what I read in other posts I'm assuming that the baseband has something to do with the modem. Is there anyway to change it to stock or am I stuck with it?Are you getting the "system version" and "baseband version" confused?
If you go check your phone you will see the baseband says lux_telus while the system says retca FWIW
Also did you set the connection speed under network providers to 3G or LTE preferred?
I'm not on Wind but know that they aren't the speediest network, do you have another phone to compare to?