1 BB instead of Congeal is a great idea. But personally, I would keep 3 Explosions. You won't get enough fire quanta to do "serious" damage with the Lance, and I like having a good chance to draw some PC early. Yesterday I played around 20 games in PVP2 with this deck, and I ran into a bunch of mono aether decks... I was REALLY thankfull for having 3 explosions against those Phase Shields.
I also like to destroy some Towers/Pendulums with them, if the enemy has an unlucky start and only draws 1 or 2 Towers in the first 3-4 turns