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So, " It is the best ever " means it's the best of all time, up to the present. " It was the best ever " means either it was the best up to that point in time, and a better one may have happened since then, or it includes up to the present. Your example already shows how to use "best" as an adverb.
Understanding the Context
It is also a superlative, like "greatest", or "highest", so just as you would use it as an adjective to show that something is the ultimate example of it's kind when used as an adverb you do so to indicate that the adjective it precedes is to the highest degree possible. In your example "experienced" is the past tense of the verb to ...