Hi Alec,
We want to thank you for your order and also for taking the time to leave a review! I am sorry you are having trouble on certain bikes. I think we can help as the tool does work well with larger range cassettes..
I'd like to start with understanding your bike(s). Please send me a picture of the rear derailleur of each of your bikes.
We would also be happy to do a video call with you at your convenience.
Thank you for your patience and support!