I have just put in the Bolton controller upgrade on my 2019 step thru and only got 20 km max distance. There were two big hills. The hills are the reason I put in the upgrade. Has anyone else done this? What were your distances? Maybe I made a mistake. Going to try a flat ride today and see how far I can go. Anyone else done this upgrade? Thinking of buying a larger battery. Can I do this snd still have the bike work properly. Help needed. Thank you