Okay, I was remaking the whole comic for the Webtoons format just a few months ago, so a bit of my experience.
Originally we posted in page format for a year and had a small audience, but some time after we cut it into scroll, we made it to the front page. I don't know if that's coincidence, but that's what I am building on! :з
90% of our comments before cutting was "it is nice and all, but please remake it to be phone friendly", aka scroll format. So that's something to be expected, especially since you have quite a bunch of panels per page.
The font is too small. It would become better when you make one panel the same width as a screen (but probably not enough anyway). I know, I had the same problem 
Most people would prefer longer updates to shorter. They could complain "we need long episodes once a week", but most of them voted long updates even if rarely.
I don't think comic being black and white is bad, there are quite a nice amount of very popular b&w comics out there!
I see that your comic would be pretty hard to cut and there are some good amount of pages already... Though I think it could be worth a while, no one is rushing you ^^
But also, there are popular comics there that are still in traditional format! Since your episodes are pretty long, you may not need it. Imho it would be better to cut it, but I am not sure how much time you'll spend to do it... So maybe just try to put it on Webtoons for beginning, maybe you'll make it to the front page immediately! 
I am still doing the comic in traditional pages on Tapas and just cut them for Webs later.