Hi Brian. There are no “right” Mapper or filter settings. Although the User Manuals suggest selections that provide good results it is ultimately for the user him/herself to choose what they prefer. Such preferences may change from individual to individual or from system to system and even from one album to another. The latter is also, of course, also subject to the format being played.
Generally I would not advise changing settings for every album or track. If you do this you will never enjoy music on your Rossini. Sure, you may want to experiment from time to time e.g. you seem to have found that you prefer Map 3 to Map 1. However if it were me I would leave it on Map 3 for a couple of weeks then go back to Map1 to check. Just like Map 3 made Map 1 sound a bit thin for you, maybe Map1 will then make Map 3 sound a bit fat. Or maybe you will then decide to stick with Map 3. There is no rush, just let your choices evolve over time. Broadly speaking, aside from choice of Map and DSD filter 5 ( which only became available with Vivaldi v.2.0), my choice of settings has been the same for the past 10 or more years despite having changed all of my dCS hardware during that time.
Of course if you genuinely cannot hear all of the differences then that simply reduces the number of permutations of choices to be made. Often the difference may be quite subtle and not reveal itself on a quick A/B comparison. However after some hours of listening you may find yourself thinking that you are not enjoying things so much as you did.
As the choice of digital filters for different resolutions are not necessarily he same ( even if some of the different filters at different resolutions carry the same number - do be aware of that), Rossini will remember the filter setting that you choose for each one.
The object is that after a while they should all have been set and forgotten about 
What Mosaic v 1.1.3 does is in the Software Release Notes: