Hi Eliza!… I had exactly the same problems… ended up scrapping the RKT for my project.
Since then, I came across a fab tutorial by Lizzo Marek.
Haven’t tried to use RKT since seeing the tute… but prob will, one day, when a design requires it.
Hope it helps:
http://artisancakecompany.com/2014/10/how-to-sculpt-rice-krispy-treats/
Julez, https://www.facebook.com/pages/Allways-Cakes/450634018350115?ref=hl