im pretty sure they dont get any softer, ive had mine for awhile and still the same, if they were to get softer then wats the point in hasport innovative etc making stronger engine mounts if there gonna get soft again? prob best go with poly inserts like phillip
if u want the softest ones id be looking at 60A, 70 + will kill u unless u wanna track. if i were u go for the 60A, hasport only make 62A so id be a tiny bit more stiff but i doubt id be that noticable