Hi Etain,
I agree that this spread really asks you to get in tune with what your question is about. Because the cards are essentially grouped into only two positions, past/known and future/hidden, it requires that we tell ourselves stories about the groupings in a way that is different from the Celtic Cross. We can either be more intuitive or more intellectual. I also find it easier to start seeing what I expect to see, though...
I went throught the Complete Book of Tarot Spreads looking for your bow and arrow, and didn't find anything like that. I did, however, find a 7 card spread called the Sword, laid out as follows:
xxxx 4
2 xx 1 xx 5 xx 6 xx7
xxxx 3
and that looks as much like an arrow as a sword, I think. Positions are interpreted as follows:
1. The heart of the matter
2. Your starting point
3. Your base or support
4. You chance (what will aid you)
5. A problem is being solved
6. A desire is being fulfilled
7. New knowledge, new insight
Does that seem familiar?