> I have used swarm optimization methods that have consistently provided better solutions than alternatives for optimizations of solution spaces in alterst 3 different domains.

Benchmark your PSO implementation against a) a naive Monte Carlo implementation with an uniform distribution, b) low-discrepancy sequence, c) a global optimization algorithm such as DIRECT, and compare convergence rates.

I'd be surprised if your PSO implementation did not competed for the last place in terms of function evaluations.