7 wood and 4 hybrid required ?
if you have a few par 3s that are a perfect length for one club, then you might be best keeping the one that suits those 2 shots.
If it is more for hitting longer approaches and these will be generally different lengths, I would go with the one you hit most consistently.
At the end of the day an iron / hybrid is about hitting a consistent distance, not necessarily hitting it the furthest.
Personally I would be playing the hybrid all day over a 7 wood. You are surely going to get better results from that playing from fairway or 1st cut - which is where you will be using it from most often (assuming you don't have a load of 200 yard par 3s).
I have a 3 wood which I love hitting from the tee, but then I go 3 hybrid, 5 iron. If I am 170 out, a good 5 iron might get me there. Any more and I'm hitting my hybrid, knowing that a good hit will never go more than 190 and probably my average will be in the 180s. Obviously it takes a great shot to hit a green from that kind of range, regardless of what club you have so I struggle to see how a 4 iron or 4 hybrid is really going to change my game.