15x8 rims is difficult to match with normal street tires cuz too wide for small diameter. 205/50/15 can but already a bit stretched and even that is already not many choices, just a few extreme category tires. So best is just change rims with narrower 15x7jj so you can use 195 tires which is widely available.

Evo 3 twinpot doesn't require wide rims, cuz it's almost same thickness as normal calipers. Change rims to Konig Hypergram, that's the best value for money rims now. 15x8 rims are usually for drag cars or race cars using slick radials. Those 15x8 mostly sold on the market are cheap fakes and heavy.

Stretched tires negatives:
- not much play left on the sidewall hence will feel stiffer/less comfortable.
- treads on the sides will wear out sooner.
- no protection on rims cuz the rims protrude out more than the tires.
- more risk of puncture to the sidewall as it's more exposed.
So in summary, not recommended at all to run stretched tires.

Use 7jj and just 195 tires so got many better choices. Westlake is China brand tires, not good, and you cannot just be relying on 1 tire brand/model.