Modding Help Is there way to make explosiveburst's projectile explode on collide instead of on cursor's location?

Hello all,

I was trying to figure out modifying weapon by my self, But hit on my limit. Can someone help me out?

Code:

   "altAbilityType":"explosiveburst",
   "altAbility" : {

   "name" :"Homing Burst",
   "projectileCount" : 1,
   "fireTime" : 0.5,
   "baseDps" : 150,
   "cooldownTime" : 4.6,
   "energyUsage" : 40,
   "projectileType" : "mechhomingmissile",
   "projectileParameters":{
     "speed" : 45,
     "timeToLive" : 8.0,
     "knockback" : 70,
     "actionOnReap" : [
       {
        "action" : "projectile",
        "image" : "/projectiles/activeitems/guidedrocket/guidedrocket.png",
        "type" : "shrapnelbomb",
        "config" : {
         "power": 5,
         "processing" : "?hueshift=-150",
         "fireSound":"altFire"
        }
       },
     {
     "action" : "projectile",
     "type":"physicalexplosion",
     "config" : {
     "power" : 25,
     "processing" : "?hueshift=-150","fireSound":"altFire"
     }
    }
   ]
  }
},

Also I tried to make at least shrapnelbomb's projectile image into something else but didn't worked.
Is there something wrong with I wrote?

Thanks,