Wow. You're a dedicated pollster. Lots of work.
When I did the best rock album debut poll with 120ish nominees I just did a select your favorite 24. The top 24 made the next round and then it was your top 8 and those 8 made the final round. No one on one matchups at all.
When I did it that way there was some clear differentiation from say the top 24 and the rest. In fact over 40 of the nominations did not receive a single vote - meaning even those that nominated them did not vote for them. And then another 20+ got a sporadic vote or two. Lots of dead weight.
So you could do similar just have the 120 and everyone vote for their favorite 24 say. Take the top 24 and ties the next few to make a 32 round bracket.
But whatever you decide. That just seems overly long and at least 70 of those are not getting anywhere. imho