When uploading a GPX track to Routegadget, it is possible to specify an offset before asking RG2 to "Autofit". It appears that the offset is limited to 10 seconds, which might not be enough in this case.
One thing to try before uploading your GPX track is to look at it with another mapping tool. An easy one to use is GPS Visualizer
Another one is QuickRoute
. You will need to install it on Windows PC but it's quite good. There are a few tricks that I do when fitting my track to the map, but it's generally straightforward to use.
From the Routegadget2 web site: https://github.com/Maprunner/rg2
(scroll down for links to documentation and "how to" videos)