i agree on prop being useless for non-low-dosers
"kickstarting" is a useless concept too imo.
especially with sust, because the amount of fast esters in sustanon is really miniscule. most of it takes even longer to peak than simple test E.
regular sust has what, a tiny amount of prop, some phenylprop, E, cyp and decanoate ?! thats one short ester (but its usually just what, 30mg prop per 250mg? then 1 moderate ester (PP), 2 moderate to long esters and one long ass ester. the tiny amount of prop is not gonna kickstart anything, in fact you would get a better "kickstart" by simply adding 100mg test E and thats it
just use test E and inject twice the amount you intend to use for the whole course for the first 2-3 injects. then you have peak levels within the first week.
and even with regular every day injects you get close to peak levels within 2 weeks with test E...