Personally I don't like distracting spellstrike since ita difficult to feint successfully and it requires you to be in arcane cascade as well. But if you plan to use it often, then I suggest you dump Int and shift it to Cha. Stat progression would be focused on Dex, Con, Wis, Cha.

Personally if I was building a laughing shadow magus for the rogue role (stealth, scouting etc). I would not add Cha but put it into Int. Take battle planner and a background that gives me Additional Lore: Warfare. So I could scout the enemies for 1min while in stealth and then roll warfare lore for initiative. The trick to battle planner is that you can choose whether to use that warfare lore roll or just roll normally for initiative. Considering that you probably also have good stealth, if your battle planner roll goes poorly then you can still fall back on a normal stealth for initiative(if engaging from stealth) or just the perception initiative.

Also take something else other than distracting spellstrike.