Have you tried condensing your pages for each chapter? I've seen users here make long episodes that have like 25-30 pages fit altogether seamlessly into one large episode. In my case, I had to fuse two pages (37 and 38 I believe it was) of Chapter 4 together for my comic Life of an Aspie in order to be able to fit in a notice I created at the start of the chapter for new readers. What I did was open the finished files for the two corresponding pages, copy, cut, and paste one of them into the other file, and then play around with the size settings for both "layers" until it looked good enough to publish with the reader being none the wiser as to the fact it was two pages sharing the space of one.
Another thing you can always consider is when working on a new chapter of your comic is to simply condense it down to fit under the allotted 40 page limit per episode anyway. Some plot events that I envisioned before for LoaA that would have taken up a few pages either got condensed down to just a couple of pages or were cut altogether if I felt they didn't fit in with the tone of the chapter or the overall story. As a result my shortest chapter is about roughly 34 pages (not counting the cover, content warnings, or the acknowledgements page) on average and 38 pages for my longest at the most.
Hope this helps.