I watched the demo video but I can't get over using E in the bass in bar 5, where D would normally be expected. (Yes, it should be possible to use chord V11 her

I watched the demo video but I can't get over using E in the bass in bar 5, where D would normally be expected. (Yes, it should be possible to use chord V11 here instead of IV if you really want, but you would need to fill out the harmony a lot more to make that work, not just the bass line.)