Help with my Rotation for Summoner when using Fester

[Blackcanary]

So i've made Macros to make life a lot easier. But I can't seem to keep a high dps when using Fester.

I have 2 marcos

First one goes: Bio>Bio II> Miasma> Fester

this will mainly give me a damage of 679 and sometimes 900

Then my second Macro is Bio>Bio II> Miasma> Ruin II

then i would use Fester and i get the same results sometimes higher. I Use Virus before i use my macros.

My problem is i can't seem to always get 900 damage points or higher.

Am i doing something wrong can someone please help me