Yeah the lowering part isn't really something I am chasing, but wasn't sure if there were springs that would give a little bit tighter suspension while maintaining OE height or close enough to it. I do appreciate the tire suggestions! I just moved to TN and was under the impression the 20-30 degree days were only once or twice a year but the last few weeks has proven otherwise! I would likely only have the one set of wheels as I would dump the originals and put it into the current or near future plans for this car. Tbh the 16" wheels were more to save a few bucks, which with what I am doing with the car seems futile.Great that you're having fun with the car! How are you trying to make the car more fun to drive? Tell us exactly what you don't like and what you want to change - figuring that out will help you with what needs improving.
As for the smaller wheels, I would stick with your 17's or move to an 18" package (the stock 19's always seemed to be a bit overkill on the weight/sidewall compromise). If you were racing lightweight 16's would be better, but regular driving on real roads will reward shorter, stiffer sidewalls (better response). Adding sidewall adds compliance to the system and can dull out response and feel, everything else staying the same.
If your local weather permits it, go with a max performance summer tire (Pilot Sport 4S is my current go to) - you will gain sidewall stiffness and tire grip over an all-season. If you have a little bit of snow or just sustained cold weather (below 45F) and don't want to have summer and winter tire sets, look at high-performance all-seasons like the Michelin Pilot Sport 4S or Continental DWS06. The difference between those and the two you listed is quite large for grip and performance driving.
I'd probably stick with your stock springs; I've dealt with the scraping on a mild drop on my old 1st gen 6, and my stock height ATS and it sucks to deal with. I could dive into sway bar changes and chassis braces, but you really need to define what you want and the compromises you will make to get there.
As of the last few months this is what I have already done (put in the AEM CAI 70k miles ago):
-New front struts, mounts, strut bar
-New front lower control arms
-New outer tie rods
-New front swaybar links
Will be completed in the next few days and others within 2-3 weeks:
-Custom 2.5" exhaust with 2 Borla S-Type mufflers, Borla straight pipe, MagnaFlow Y pipe, Vibrant angled piping, and Borla 20248 tips (rear cat removal and resonator removal)
-Sound deadened half the car (2nd half this weekend along with 4 new door speakers and a 1000w amp)
-Interior personalization (blue LED lighting under front seats, and front footwells)
-Considering new headlamps
Plans for the next few months:
-Rear suspension replacement (already have the B6 shock absorbers but need control arms, lateral arms, strut bar)
-Tune through DrTuned (talking to a local shop about options there as they have a Dyno if we can work out a way to turbo this bishh)
-Body work to correct dents/paint repair (thinking about more like skirts or spoiler but nothing looks good and currently it's too slow to warrant it)
Pipe dreams of the future:
-Rebuild a blown motor to make the fastest 2016 Mazda6 Sport the world has ever seen (so like 240 horse would do it right?)
-Turbo or supercharge