Here are some strategies that I find work on Primedice.
First Strategy:
Bet 2x a small portion of your total btc, every loss double your bet amount for 1 bet then revert back to original bet.
Eg.
Bet 2x 100 - Win
Bet 2x 100 - Win
Bet 2x 100 - Lose
Bet 2x 200 - *Most often its a win (if loss bet 400, then 800 etc until you hit a win and you will always profit, you must bet low enough and stay low enough to sustain or you will bust eventually though.
Second Strategy:
Bet 3x-4x small amount usually will give a decent return as long as you bet low enough and can maintain a losing streak.
Update 2017-08-09 -
Make sure to change your fairness often, as well change the dice from high to low once in a while. Using a vpn to switch your IP Address occasionally is most effective though.
Will post more soon. Doing research. Post if you know any thanks!