I made several crosses in the late 90´s.I used two different JH female cuttings ,vintage 97 If I don´t remember bad.For the male part I used the 2 best out of 17 colombian males from Corinto.This "Caucana" strain was very hardy and could be grown outdoors here,finishing by mid November.vey mold resistant and very uniform.Also very important is the root system.I think that the JH was originally developed for hydro systems.I´ve found that then JH has a weak root system outdoors around here.However,the f1 hybrids and beyond had a noticeable stronger roots.
So,,I´ve found that there´s advantage on crossing a "strain" (JH in this case) with a stable,decent sativa "landrace" originated in tropical areas