You did not say what epoxy and hardener you are using. The Mas with slow hardener that was supplied with my kit took about 45 minutes to kick most days. Shop temps varied around 60 to 70. The West with medium hardener I used after running out of Mas kicked around 25 minutes. 

   I would back up your pumps with a scale just to check.

   Mkcagle - yes, it is Mas. Last little test batch was still soft after 45min though consistency was more thick and less like syrup.

Happy Hooker - I will try that too.

Also, heat output was nowhere near what I expected.  

Thank you!