Using bombs intelligently is part of being a good Touhou player. I think Jaimers said it earlier in this thread, you want to plan a bomb route. Know what's likely to kill you, and decide where you will spend your resources. For example, when I did that 90fps thing, every single bomb was planned. When you work out paths for the game (and believe me you'll want a path for stage 3), you should integrate bombs into it as well, because nobody can win with just rope and lamp oil reactively using bombs is not really how they're supposed to be used.