Need advice on pronunciation of the 'r' and 'ĥ'

I’m very pronunciation-focused; I record myself every day and compare it to audio on Tatoeba. I’ve mastered the Esperanto 'r', but the 'ĥ' sound is consistently getting flagged by my software. I’m thinking about using Chickytutor.com to get specific feedback on my articulation of these rare phonemes—has anyone used them for accent correction before?