Interesting video, thank for giving numbers of your experiment.
So less than 1 SBD interest for 300 SteemPower over 2 months
And over 8 SBD for 2 months of 300 SP delegation
Recommendation
Normally, you should try to keep at least 50 SP in your account to be able to use it.
Delegation Projects
2 other nice project to give delegation :