Can't submit PR for new experiment

[earcanal]

I'd like to submit a PR for a new experiment. After merging with upstream, I get the following error when I try to push my fork:

Counting objects: 4111, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (3573/3573), done.
remote: fatal: pack exceeds maximum allowed size
fatal: The remote end hung up unexpectedlyB | 7.18 MiB/s   
error: pack-objects died of signal 13
error: failed to push some refs to '[email protected]:earcanal/expfactory-experiments.git'

The error message truncates it, but the push is in the GiB range (2.8G .git/objects/pack ) i.e. above the 100M maximum. I realise this is more of a git(hub) question, but I'd be grateful for any pointers on how to submit the PR, as I haven't managed to resolve the large commit issue after reading this, and this SO post.