I would like to learn when to use 都 and when to use 也 in the 连。。。都／也 structure.
My current understanding is that 都 is often used for positive sentences whereas 也 is generally used for negative sentences, e.g.
他 什么 都 吃，连 狗肉 都 吃。 我们 连 一 次 也 没 见 过。
However, I can see many exceptions to this 'rule'. Any more hints on when to use 都 or 也? Does it matter in general?