Very nice Excel file. I used your coords at TS and SC, did a right angle intersect from SC to the tangent line to get the spiral tangent = 204.603 and offset = 14.422. I used those 2 plus the L=205.522 to make PCSurvey draw a spiral. I made that spiral an alignment and ran a station offset for your points TS,CC!,CC2,CC3,CT4,SC. There are a couple hundredths error but that is most likely just the difference in our software programming.
There is a problem with Curve 1. Holding the L=83.289 and R=3601.717 then the Delta is twice what you have or 1d19'30" which when added to the other Deltas gives a better total closer to 12d07'42" for a spiral Delta using your tan and offset.
This is not criticism. This is me agreeing with the results of your excel file.
I've got a spiral to figure out which became an urban road from a US highway. SCS curves were a breeze in Autocad 2002 and I kept a version on my computer till this year when I got a new system and lost 2002. So, this was my first time trying it in the 2025 version. I finally figured it out that setting up the curve data first made it easy. Once the spiral curve spiral elements are set up all you need to do is draw the tangents pick them and the alignment creates the curve. Not as easy as 2002, but still fairly simple, once you get the hang of it.