Not so surprisingly, sprinting on doors and heads causes the same issue. However, I don't think the particles for end portal should be a concern, as they are not intended to be punched. I have also managed sprinting on them, by placing repeaters over them, and they have also produced Nether portal particles.
As a temporary fix, I could compress your TP just below 10 megs, by using optipng, advpng, and advdef, in two rounds, and then optimizing the archive with advzip.
It is so "small" that it fits as an attachment! (ftb_isabella.zip)
Added pictures for my previous comment