I’ve used the Protopasta HTPAL-Carbon, with heatset treatment.
Like: Super light, easy to process, nice matt finish
Don’t like: warps easily during heat treatment. So follow instruction and leave support material and raft in place when moving object to an oven.
I use my heating plate, and simply placed a small insulated box on top of the object, set the bed to 100c and leave it overnight. Reduce the temp to 80c for 1/2 hour, then 60c for another 1/2 hour. Before removing.
It is stronger. But I am not 100% sold on the added cost / Value. Wish I had access to a stress tester and validate the claims.