Does anyone (successfully) record as-built data against a baseline in Asta ??

Had a on-going problem for years now with recording as-built data in Asta against a baseline programme. The columns I have set up are:

Title, duration, Percent complete (or overall percent complete), planned percent complete, start, finish, actual start, actual finish.

I then want to simply record where activities start and finish in relation to one another, so each activity title has 2 bars, its planned start, finish (the baseline "Contract Programme" that never changes), and its actual start and finish on site.

The programmes are fully logic linked, and by rescheduling at each progress period, I need to see a "what if" scenario of delay to handover.

Now, so far, this all sounds like a pretty standard, run-of-the-mill process...? My problem stems from Asta deciding to move bars that have previously had an actual start date applied to them... I can give a bar an actual start and then (randomly) Asta will decide that on rescheduling, it will move the actual start to a different date.

If anyone does this process successfully, please can you advise your settigns within the software eg in Tools/Options and in Format /Barchart etc

Thanks