Roughing and finishing - 2D model

Hello!

Fairly new to CarveCo and have reviewed a few posts similar to what I'm after, but have not found what I'm looking for so wanted to shoot a quick message out.

I am doing some sign projects (2d carve) and need some clarification on the settings for roughing and finishing passes.

My goal is to use the Allowance setting and my understanding is that this is the amount you want to leave behind during the roughing pass (positive value) for the finishing pass to come by and clean up.  

My goal is to have a final depth of 1.75mm with the finish pass shaving off .25mm of that.  

For the roughing pass, should the final depth be set to the 'actual' final depth I am after, or the difference between the desired final depth and Allowance value?  i.e. Should I set this to 1.75mm or 1.5mm given my Allowance of .25?

For the finishing pass, can/should this be setup as a second tool within the same tool path?  Or is it better / cleaning to defined a separate, second tool path for the finishing pass?  Related to this, is it expected that my finishing pass will be done with the same tool, or are there reasons to use a smaller/different tool given I am going over the same areas?

When setting the parameters for the finishing tool path, should the start depth be set to the value that the finishing tool path left off?  In this case, 1.5mm?  Or, is there something else in the software that tells it where the finishing pass should start?

In the finishing tool path, the Allowance should now be set to 0 for the final clearing of material (.25mm), correct?

Thank you, all!  Really appreciate any feedback, additional tips, pointers, etc., you may want to share.

Have a good one!

Bob