yes that is fine to do. that amp should be perfect for either one sub at 4ohm which is the only wiring option (200w going to a 150w sub) or 2 subs wired at 2ohms (350w going to 300w worth of subs). Forget what I said about "bridging" your amp basicly automatically does it.
In the diagram above, your amp would be on the left hand side.
Basicly what I'm getting at is that is a very good amp for those subs. Don't waste your money buying a new amp because you won't be any happier. Its either your enclosure or your subs that you are not satisfied with.