Winter tyres for summer sportives?

I am not the fittest or youngest - but last year I had too many punctures on sportives and charity rides using specialized all condition tyres that came with my Specialized Roubaix bike. . I changed to Continental Four Season for the winter - and without tempting faith, have had no flats! Should I leave them on for the summer? I don't race but want to complete sportives without giving myself an additional disadvantage of dragging too much rubber around. Any advice on what I should use gratefully received. :?
purplehaze
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How much time would you expect to lose to a bit of extra rubber compared to a puncture stop?
Personally I'd leave them on.