H/JF the hardy varieties often do have smaller flowers IME. Oh apart from Mrs Popple that is- I assume my Dads' plant is that. Just know it withstands very cold winters in WMidlands & has done many yrs. I've got a couple now in my garden & yet more cuttings, just in case. Just call it Dad's fuschia!
I grow Greyrigg & Hawkeshead. GR definitely is hardy, came trough the last couple of winters up here. Late at restarting in spring, but very delicate white/pale pink flowers. There's a good sized shrub of it at Harlow Carr which I spotted last yr.
Hawkeshead, which has small white flowers, I did actually lose- when I didnt protect its' roots in a large pot!
So I now have a new plant in the ground & several good cuttings- still in my porch! J.