是的，quite 通常不用于修饰比较级。但是，巧了，根据 Swan 的 PEU，这有一个例外，那就是 quite better（表示身体康复或痊愈）：

Don’t start work again until you’re quite better. 等你完全康复了再开始工作。

I’m quite better now. 现在我已痊愈了。

Good news. The letter says your father is quite better. 好消息。信上说你爸爸完全康复了。

Mother’s leg seemed quite better after her operation, but recently it’s been acting up again. 手术以后，母亲的腿似乎好了许多，不过最近又疼起来了。

同意奉老师的解答。

顺便补充一下Michael Swan的英文解释，供参考：

Quite is not used directly before comparatives.

She's rather/much/a bit older than me.(BUT NOT She's quite older …)

But we use quite better to mean 'completely recovered' (from an illness).

所以，可以转换为：Don’t start work again until you’re quite better.(= … until you're completely recovered.)

此外，王福祯主编的《英语词语用法详解词典》p.764也有类似的解释(节选要点部分)：

一般说来，quite不可修饰形容词的比较级，但却可以说quite better。

quite虽然不可修饰形容词的比较级，但却可以修饰形容词的最高级。例如：

You are quite the most exciting man I've ever known.

You're quite the funniest guy in Minnesota.