Sorry for submitting multiple runs so short after each other - next time I will wait until I think it's more optimized to submit.

Used a Pandora's Box glitch to remove all my cards, then found a Grand Finale for sale on the 2nd floor. Around 6 minutes in I use a branching path glitch to skip the transient.

I might be able to use this glitch to improve other floors in the run too, but it's not 100% consistent for me, so I will have to practice more and also see if any floor actually benefit from it. It would be nice to skip giant head, but doesn't currently seem possible - maybe it would be if you did the same seed on A1 instead of A0. My goal is to get this below 6 minutes with some gameplay improvements and possibly some rerouting!