Board width to get high aspect foils going

Hello, would really appreciate some insights about how width affects ability to paddle up especially in almost flat or very light wind conditions.
I got a 7.5’’ X 21"X120l f1 board and can flatwater start my PNG1150 on demand, but not even close to getting my EagleX 1000 up. I’m 78-80kilos.
I’m thinking going narrower and longer but these boards ain’t cheap so would appreciate any advice about how much of a difference will it make going to a
8.0X17" @106l or
8.4"X17,5" @ 114l (these are the F1 downwind comp boards)