i have used the HPI R40 foams a couple of times and had no problems with them in regards to chunking. They are just a bit higher price than the ones i usually use, Ellegi. Jaco nitro shoes tend to chunk more than HPI R40. I am also not a big fan of spoked rims. I like to keep as close to dish wheels as possible.
Most foam tires (ellegi, HPI R40, Fast Tyres, Trinity) all come from the same manufacturer. The manufacturer is GRP Gandini. The companies just put their own wheel on it.