You can't really change the ramp angle between the rough cut and the finish cut, but you can get the tabs to work on a clean up pass without removing them.
The trick is this. Change the second op in the DMS portion of the strategy window so that you have a "Rough" pass followed by another "Rough" pass instead of a "Finish" pass. Set up the second rough pass just like you would a finish pass with no allowance and a single pass instead of multiple passes. Once you've done so, you can either click on "Finish" or "Compute Toolpath", but neither will show a change. When you are in the nesting system, you have to go up to the "Nesting" part of the CAM tree, right click on it, and then "Compute All Toolpath" from there. You should get a second cut closer to the geometry at full depth in a single pass, but still jumping the same tabs as the roughing cut. I've attached some images of the general idea. Look at the file name to know what each is depicting as they are kind of out of order.
Another thing is that it can get messy in nesting to have your geometry running into the same quadrant as the stock and nested parts, so try to remember to put your part geometry in one of the other three quadrants. If you get to something more complex, you'll find it really hard to figure out what's going on exactly, so it's just a good idea to try to separate the source geometry from the nested sheet.