My take is there's always a way forward; however tough our problems look! Here's me addressing and hopefully conquering my long-term barriers, using Taplature of course! The ideas demonstrated here can be used to solve problems for all styles and levels of guitar! How do they relate to your own barriers?
2 weeks on and I've pushed both measurements up a bit. Feels like a long way to go before they'd be really usable though!
With the higher thumb I've added some more movement across the string to give the required impetus but that's come mainly from rotating my hand rather than just in the pulling finger. Probably not ideal but we'll see where it leads!