Me too, I have 1LC completed this game numerous times... I guess I'm choking.
Found a better place to do the score 1up (multiple 1ups even) with the 3xZombie Holy Water point press. After you do the bat hop short cut and go through the door on the other side, you'll go through the door and be in the hall to the lvl boss. Drop down from the platform to the floor level and walk back towards the door side you just came from and stand where the last column to the left is. You should throw your holy water about where the Zombies drop down from the middle right platform. When the first Zombie of the group of three gets close, chuck your water. Sometimes you can hit a 4000 pt 4th Zombie too. If they are not coming at you from the upper left platform whip or holy water the others until you get consistent groups of three coming from there. I've gotten +/- 90,000 pts after lvl completion.