I have made them with my own rosin, that I pressed from flower and also from rosin I purchased from the dispensary.
Not sure I understand what you mean by it being a little off. Just heat, rosin, and a tiny bit of terps or viscosity booster in them so far. Maybe
@PeakSupplyCo could comment on their proprietary ingredients. It is possible to make carts without them if you don't want to use anything. They are smoother and can add flavor for carts that may not have any left from a bad dry or cure. Or to just boost the flavor some more if you desire that. I feel safe using their products in my carts but I understand the reservations some folks may have.
That's why I made some for myself. To avoid having to spend a bunch of $ on store purchased carts.
I am fairly certain that they did not use vegetable glycerine in their products. But I cannot say for sure.
Sorry for the late responses folks. Hopefully I can make some more carts soon. I have plans to make a bunch of rosin soon, so making carts is getting worked in there somehow. I'll be sure to document my recipes. Thanks for chiming in.