I think that you did get a number of answers from the vet, although I am sorry that this is not working itself out as you hoped. You are taking excellent care of Sassy where many would probably not have been so dilligent.
Let me just address low blood pressure. In the United States at least, we are all primed to worry about high blood pressure. Low blood pressure is almost universally viewed as desirable and healthier. It is not; in the extreme, someone can die from hypotension. In a human, the symptoms which include things like confusion, nausea, blurred vision, clamminess could be expressed in time for medical help to be found. A cat cannot tell you that any of those things are happening, so it is probably why your vets don't want to move her into sudden low blood pressure.
Call your vet and ask whatever questions you have. A vet tech could relay them to him and give you a response. You are doing so much for her that it is not unreasonable to think that they might take a minute or two on the phone with you. Don't mess with the BP meds on your own; however, now that you know how the monitor works and what its range is, you can use it whenever you see fit and that might be a good log to keep.
Let me just address low blood pressure. In the United States at least, we are all primed to worry about high blood pressure. Low blood pressure is almost universally viewed as desirable and healthier. It is not; in the extreme, someone can die from hypotension. In a human, the symptoms which include things like confusion, nausea, blurred vision, clamminess could be expressed in time for medical help to be found. A cat cannot tell you that any of those things are happening, so it is probably why your vets don't want to move her into sudden low blood pressure.
Call your vet and ask whatever questions you have. A vet tech could relay them to him and give you a response. You are doing so much for her that it is not unreasonable to think that they might take a minute or two on the phone with you. Don't mess with the BP meds on your own; however, now that you know how the monitor works and what its range is, you can use it whenever you see fit and that might be a good log to keep.