Your
HQs are fine for what they do so nothing to change there:
Your lootas dont need the three meks, just a normal squad of lootas will do as the pure fire power of the dakkagun outweighs the big shoota.
The troops seem fine but that shoota boy mob is gonna take a while to get to the fight. Keep them as they are if you want objective holders but I might suggest you drop them for another stormboyz unit or maybe even kommandos if you want to get to the fight quicker.
Stormboyz are nice, but bare in mind they aren't going to be around after they kill off that one unit they charge into.
Nice little heavy supports, nothing really to change there.
if you want to go up to 2000pts I sugest keeping the
HQ and troops and make it double force org. That way you can have another battlewagon and don't have to drop the lobbaz. Also get more lootas, they are by far the best choice in the ork army for long range shooting. Finally consider getting a big mek with kustom force field, it will keep the battlewagons alive longer from surprise drop pods or the odd infiltrator unit. Hope that helps mate