@eiliscoleman if you are prepared to write software, you can use the OpenSensors.io API, but really that's all I'm doing with the Download Tool (source code). To the best of my knowledge OpenSensors.io doesn't have plans to create a front-end experience for non-developers. That being said the team here at Wicked Device and I are working towards improving accessibility of data.
For what it's worth, I think some of the problems you experienced recently may have been related to OpenSensors.io development team working on improvements to the performance of their API service that inadvertently introduced a bug on their end (that they identified and resolved based on our feedback). If you ever experience unexpected or frustrating behavior, please let us know. If we can do anything about it we will, and if there is nothing we can do directly, we'll escalate it.