Of all the bikes I have had over 45 years of riding I have found the Versys to be fussy with chain tension and lube. If you don't have an alignment tool get one they are cheap
Keep the tension at the recommended tension and check for uneven tension. The way I lube my chain is I get home from a ride so the chain is hot.
Put the bike on the paddock stand.
I put some cardboard down to prevent overspray.
Spray the inside of the chain until it is wet.
Go inside and get out of my bike gear and leave the bike for 10 - 15 mins or so.
Wipe the chain down with a rag to remove excess chain lube.
I do that around 500 - 600 km intervals, obviously more often if riding in the rain. And we don't have salted roads so maybe you need more often.
When the chain is visibly dirty or if I see sand or grime I clean it with chain cleaner and ride it for 20 - 30 mins before lubing.
Oh the alignment tool? I use that if the wheel comes off for tyres or any reason when I reinstall the wheel I check the alignment.