Why not have 2 macros? One for pets to attack/recall and one for hunter shot cycle. Can you post your attack macro?

In general, there are a few fixes for initial aggro issues.

1. If BM, get pathfinding. That 30% increase to speed means you can start an attack, and the pets should reach the target much faster.

2. What pet are you using? I am using 5 boars. Charge is so full of win, I can not stress how powerful boars are in initial aggro.

3. When you hit 30 something, you can pickup dash/dive depending on the pet you have.

4. What shot are you opening up with? An arcane shot/auto shot 2 hit instant hit can be tougher for your pet to get immediate aggro.

5. Are you using Omen or another threat/aggro monitor for testing? Watch what your main's threat is and the pets. If you watch these numbers, it can be helpful in learning how hard you can push the hunter dps.

6. Once you get frost trap, just position mobs between you and the trap and have fun.

7. If all else fails, put in concussive shot in a mixed rotation. So your main opens up with concussive, then shot 2, shot 3, etc. Party 2 opens with shot1, consussive, shot3, etc. Continue this for all hunters. I would really place this in another macro though, with a reset of 15 secs. Don't forget there is no diminishing returns in PVE.