Particles never always go in definite direction.

Hello. I have this particle effect I have created. It's is supposed to be a wave of fire that damages an entity when I run the scheduler. This works okay, but the particles don't always make a radial wave that dampens. Sometimes it floats into the air, sometimes it travels beneath me, sometimes it works correctly. But because locations are messed up, it NEVER damages entities. I have my scheduler below. Any help would be very much appreciated!

Code:

public void run(PlayerInteractEvent e) {
              final Player player = e.getPlayer();
              final World w = player.getWorld();
              new BukkitRunnable(){
                      double t = Math.PI/4;
                      Location loc = player.getLocation();
                      @SuppressWarnings("deprecation")
                    public void run(){
                              t = t + 0.1*Math.PI;
                              for (double theta = 0; theta <= 2*Math.PI; theta = theta + Math.PI/32){
                                      double x = t*Math.cos(theta);
                                      double y = 2*Math.exp(-0.1*t) * Math.sin(t) + 1.5;
                                      double z = t*Math.sin(theta);
                                      loc.add(x,y,z);
                                      w.playEffect(loc, Effect.MOBSPAWNER_FLAMES, 1);
                                      w.playSound(loc, Sound.GHAST_FIREBALL, 1, 1);
                                      for (Entity en : loc.getChunk().getEntities()) {
                                          if(en.getLocation().distance(loc) <1.0) {
                                              if (!en.equals(player)) {
                                                  en.setFireTicks(20*5);
                                              }
                                          }
                                      }
                                      loc.subtract(x,y,z);
                                    
                                      theta = theta + Math.PI/64;
                                    
                                      x = t*Math.cos(theta);
                                      y = 2*Math.exp(-0.1*t) * Math.sin(t) + 1.5;
                                      z = t*Math.sin(theta);
                                      loc.add(x,y,z);
                                      w.playEffect(loc, Effect.MOBSPAWNER_FLAMES, 1);
                                      for (Entity en : loc.getChunk().getEntities()) {
                                          if(en.getLocation().distance(loc) <1.0) {
                                              if (!en.equals(player)) {
                                                  en.setFireTicks(20*5);
                                              }
                                          }
                                      }
                                      loc.subtract(x,y,z);
                              }
                              if (t > 20){
                                      this.cancel();
                              }
                      }
                                            
              }.runTaskTimer(MagicBattle.getPlugin(), 0, 1);