Looking at your avatar,, the first thing you need to do is raise the front end back up to at least level, that way, when the front end lifts,, it transfers weight to the rear wheels.. As it is,, it's like pushing a roller skate, the front end can't get up,, so front 90/10 shocks are in order,, there are some on our local Usedvictoria.com..
I like a pinion snubber, even though others feel strongly against them.. they've worked well on all the vehicles I used them on,, but the whole suspension has to work as a package,, no solitary item, by itself is going to be the cure....
Loosey goosey front end with proper shocks/torsion bars, rear springs/shocks,, cars attitude at stop,, big battery to pass side trunk... that should get you near the ballpark..
hope it helps..