I have a Giro Feature which has a similar low back and it does make it tricky to tie hair back. You also can’t wear high necked coats with them as the collar pushes the back of the helmet up when you are in an “attack” position (learned this the hard way at Coed y Brenin the other week!). Lovely light helmet though.
what brand is your current helmet? if its a giro or a bell then it should be covered by a 3 year crash replacement warranty…(as long as you still have the original reciept and its less than 3 years old) i’ve not had any experiences of bell but i know from experience that giro will replace it at a next to cost price with a similar product.
if its not covered i would recommend a giro…just bought a hex a few months ago and i have to say its really good.
when its been cold i’ve managed to wear the helmet in addition to a buff without any problems…