From my conversations with the main tyre guy for one of the MX5 series, 205s aren't worth it on 15x7. Stick to a 195.
Completely unrelated to an MX5, but a Pug mechanic back in aus who used to race an old 205 gti ran 15 x7's with 195's - said they were less squirmy and and more progressive and did not recommend 205 width tyres - which would annoy people with OCD.
@TRA started
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From my conversations with the main tyre guy for one of the MX5 series, 205s aren't worth it on 15x7. Stick to a 195.