I went from a Standard GS1250 to a factory lowered GSA1250 .. because I wanted the extra fuel range and the GSA had gold wheels .. yeah, yeah, some of us have Magpie DNA.
Reason for the lowered GSA was purely because I am a short arse at 5' 8" .. the lowered GSA has the same stand over and clearance as a GS and I thought it made sense ...
Things I realised:
1. I did this before some training .. I regretted a lowered version after I had improved my riding skills, especially having had Jenny Huntley as my instructor on one course
2. The weather protection on the GSA is noticeably better than the GS .. good if you ride through the winter or where it rains a lot
3. The GSA is a big bulky sod to move, especially if you ride very frequently
4. I rarely if ever filled it up because the extra fuel just added the 'last straw' of weight .. filling up every 230 miles was absolutely fine, basically I never accessed the GSA's full tank range because I didn't need to but could see the benefit if you do big long rides and an extra hour on the bike can be useful but I think a 10 min stop is probably a good 'firebreak' against avoiding tiredness, but that's personal preference
5. I think the GSA has better dynamics and throttle .. it's subtle but I found the throttle on the GSA was 'better', especially at low speeds
What I [me] would do now in that situation .. keep the GS, upgrade the weather protection and get the throttle/mapping looked at.
We all have our preferences and I reckon you have made a good decision .. The GSA is brilliant and looks the mutts-nuts.
What I did do [eventually] traded the GSA in for an F900 GS .. cue comments about chinese engines, not a real BMW etc etc .. but that is an entirely different thread/rat-hole.