PRC Local Controller issued a takeoff cancellation after landing traffic failed to clear the runway; Reporter noting new TIPH procedures are cumbersome and require additional anticipated separation efforts.

Narrative

Working Local 1/Runway 21L; Locals split. Experimental landed Runway 21L and was given a turn off of the runway and frequency change to Ground Control. Because TIPH is so cumbersome; I often anticipate separation for departures. I cleared Aircraft X with enough time for the preceding Experimental arrival to clear the runway. Just as Aircraft X started their forward roll down the runway; the Experimental that exited at Delta 4 stopped prior to the hold line. I immediately canceled Aircraft X's take off clearance. They had only traveled about 50 feet down the runway before they came to a complete stop. Once Ground Control was able to move the Experimental across the hold line; I re-issued a take off clearance to Aircraft X. This scenario happened to me twice in less than an hour; a preceding arrival failing to cross the hold line. The second time I was able to cancel the take off clearance before the departure started their forward roll. This problem will get exponentially worse if/when we go to 'line up and wait'. If GA pilots cannot even exit the runway properly; there's no way we can expect them to be able to do this new procedure correctly. Recommendation; make this a pilot deviation; not a controller error. If TIPH wasn't so cumbersome to use; we wouldn't have to anticipate separation in these instances.