Hi, About the standard 195/60R15 Goodyear GT3. What is the opinion on these tires? Do you guys honestly feel these tires have enough grip for heavy cars like FIAT Punto? Today I took the car on NICE road and did two rounds of 100+. First time it felt as if the car was floating. It was kind of scary. I felt that the car would lose grip. Second attempt the car was stable. Maybe the first road stretch was not plain enough. But will road undulations cause such a feeling of losing grip at 100?