Benchmark AHB2 Power Cable Upgrade

I have a pair of Benchmark AHB2 amps and use the Speakon connectors that are right beneath the IEC power input.  Has anyone found that a power cable upgrade is beneficial?  If so, what cable has a small enough female IEC to fit since there is very little room when using the Speakon connectors and most specialize power cables have too large of a connector. 

I do understand that Benchmark recommends their standard locking cable, but I’m interested if anyone has found an improvement using another power cable.

Thanks for the input.