You're under a bright enough limelight as of late, and especially right now, that the administrative overcharge of a reputable accounting firm such as any of the Big 4 may be worth the returns in the form of improved accountability - heh - and donations.

It'd be nice if you could commit to this. If your accountants are lagging by almost 3 months without filing an extension, you owe it to your donors. Blaming the accountants is fine, but in the end, you picked them, and you chose to stay with them.

(The value in the overcharge is really just that you've got a big bullseye you can throw darts at when accountability is required. This doesn't resonate with most entrepreneurs e.g. here on HN - as the greyed out comment alludes :) - but it does with more established firms largely for this reason.)