An Allant 8s is a significant consideration. I imagine the test ride was conducted under the auspices of a dealer? Wouldn't they be in the best position to determine your fit on the bike? The diff between the 'stagger' model and standard is strictly in whether you like a 'step-through' or 'step over' style of bike. Someone with 'short legs' need not necessarily buy the smallest size available because 'reach' is still normal if upper body dimensions are typical. That maybe why the bike felt 'small'. It is. Maybe the Medium size is a better fit and with the seat at an appropriate height the bike will feel better.