OK do you remember when I said problems with attsync are rare, well today is your lucky day. It looks like it isn't enough to just change the default value of the attribute you need to change the tag name as well.
OK so a bit better explanation on my part.
Open the block with the block editor and double click on one of the attributes (start with "X") that should open the "Edit Attribution Definiton" dialogue box, you should make the changes there, it only needs you to change the letter X to E in both the Tag and Default boxes, and click ok then select the Y attribute and change Y to N. After doing that exit the block editor saving any changes. Back in the drawing start the attsync command and at the first prompt choose select, then click on any of the blocks to select one, and then choose yes to finish the command. That should do it, you may need to do a regen as well.
Thats the basics of it. Are you wanting to alter anything else as well, you mention about adding in some excel bits ? If you want to alter the text style it might be better doing that in the "Format - Text Style" dialogue the style I used is called 1:1. I had used a scale in the insert script of 0.01 and you can adjust the size of the block in the properties toolpalette by selecting all the blocks and changing the scale. Or open the block editor and just change the text style to something else, by selecting the 3 attributes and make the change again in the properties toolpalette. There are other ways of making the changes as well. See if you can get the blocks to update correctly first when you alter the letters. And if you have ANY problems or further questions then I'll be happy to answer, It could be tommorrow though (I'm in Europe so it's getting close to bedtime).
I hope this helps get the problem sorted.
