Trigger HELP

im making zerg blood type map, im done pretty much everything except for 3 things, when i mass it only gets 12 units or so massing, not everyong, heres my trigger for it
Event
-A unit enters region XXX
Condition
-(Unit-type of (triggering unit)) equal to MASSER
Action
-Unit Group - Order (Units owned by (owner of (triggering unit))of type zergling) to attack-move to Region YYY
-Unit - remove (triggering unit) from the game
-Unit - create 1 MASSER for (Owner of(triggering unit)) at (Center of region ZZZ) facing default building degrees

^this only gets up to 12 units massing or so^

then for the hero credits buying. its like when my guy enters a region, the hero is created but it cant remove the guys, i dont know the trigger for it

Event
-Unit - A unit enters region PPP
Condition
-(Number of units in Region PPP owned by Player 1 RED))) equal to 16
Action
-Unit - create 1 hero for player 1 red at region YYY facing blah blah
-Unit Group - Remove all units from(Units in region PPP owned by player 1 Red)

the last trigger in action is not working or something... thats the problem i cant kill/remove, plz help. last question, i can live witout the answer but it would help. I have made it each kill gives u 1 gold but it sometime misses some gold for some odd reason?

for the gold after the leaderboard i got for action
-Player - add 1 to (owner of (killing unit)) Current gold
then next trigger
Events
-Player - Player 1 red's gold becomes equal to or greater than 50.00
Conditions(none)
Actions
-Unit - Create 2 hero credits at region HHH facing blah blah
Player - add -50 to player 1 red current gold

--Most important is question 2-- thanks for everyones posts since i read atleast half of em and learned alot plz help here since i read other massing triggers and all are pretty much same as the i got above (tried all in this forum)

To have more than 12 units do an action you need to use the action:

Unit Group - Pick every unit in group and do action.

Your exact action should look something like:

Unit Group - Pick every unit in [unit owned by player X] and do [Order (picked unit) to attack/move to (region)]