Macro wait times and echo are not in sync.

[CookieMonsta]

I use the following macro.

/macroicon "Internal Release"
/ac "Internal Release" <wait.1>
/ac "Blood for Blood" <wait.80>
/echo Internal Release and Blood for Blood READY! <se.10>

As far as I can tell, this echo should appear as soon as Blood for Blood is ready, because it has an 80 second recast.
When the echo appears, I recast the macro.

However, the echo often appears before B4B is ready.
Why is this and how can I fix it?

I use no other echo macro or wait macro in conjunction with this one. This is the only one.

(I also do use Internal Release and B4B separately when necessary, but for most situations, having 1 macro suffices for me.)

OK lets preface this, what you are doing is terrible for DPS and I hope you are aware that Macros don't queue skills thus inducing a massive gap between ur GCDs.

now that disclaimer is out of the way,
The Macro wait is strictly not in line with the oGCD cooldown especially over longer periods of time (i.e. it tends to "drift" depending on latency), you have to manually tune the recast timer with an offset to bring it in line with the BfB CD. From my personal testing of ur macro, the Echo is 23 seconds ahead of schedule. Which tells me you might be running in to the limit of the macro wait (i.e. 60 seconds tops).