Grape vines can get frosted after bud break but they usually regrow from latent buds growing healthily for the rest of the season even if the cropping is reduced or lost for that season. Covering the vine on the one or two frosty nights that pose the greatest danger is certainly a good idea.
Some grape vines can take up to five years to "find their feet" looking rather poorly for the first few years before suddenly turning into the proverbial "triffids"
The fact that your vine is already producing fruit means this may not be the case with your vine.
Slugs and snails can be a real nuisance to ripening fruit, more indirectly, as any nibble or blemish is likely to presage botrytis, also wasps which hollow out the grape. De-leafing around the bunches discourage the snails a little.
As it's now growing away I suggest letting it grow normally for the rest of the year, harvesting what fruit you can and prune accordingly in the winter.