T.T.
Add more rice crispies.
It's trial and error on the amount of Crispies you put in the mix. Too much they're dry as a bone...too little...they fall apart, are mushy or sticky.
And yes...stick butter works best for baking.
If the butter is already soft...it won't harden as it cools.
I'm sincerely hoping I didn't just repeat what everyone else said...
I'm at work and didn't have time to read all the responses.
If so...sorry if I repeated...
Smiles to you.