Ok I am believing you so I am leaving that Multibit Classic behind and switch over to HD because of the advantages you mention.
However many persons are having the same problem of their transaction getting stuck without any reason, and as far as I know no improvement yet over this or have I been not careful in reading this part of the forum ?
Most transactions are stuck because of the fee people pay. I am not using either multibit wallets, but IIRC multibit HD has a more updated way to select a good fee. Its still difficult to find a good fee, as no one knows that exact state of the network at the moment a TX is issued, and no one knows how the network will be 2,3 or 10 minutes in the future when the next block is found.