I’d stick with 205 or 215 max with just a lot nicer tires. 16+ rim size there is a lot more offerings on tires that grip better. I probably do 8k miles a year and 700 tread wear tires last me 5-6 years. Best to run summer tires with 300-400 tread wear that will probably last you 3-4 years which is within the 5 year standard lifespan of the sticky rubber.
Yeah our cars are not fast or handles well out of the box. But you could spend money to get power which is expensive or you can do what I do, all handling and structural mods which is fantastic for curves. A lot more fun IMO.
Aside from getting nicer tires, the control arm mod and rear disc brake will probably net you the best cornering ability after tires. Tho, there is more to be had.
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