In my experience it will dull the coke a bit, a ringer may be harder to achieve, but why separate them? I'd not be very good at hitting myself once loaded, so I would often miss the second shots too and with coke that's a complete waste and a high abscess potential - as I'm sure you know. So I returned to mixing them. You're experienced, so you know - but for others who aren't, don't do this, if you must cut the amount of each by a genuine 50%, and remember the coke wears off faster, I OD'd once b/c of this, and lost a friend to fentanyl/coke - he didn't know. RIP Roy, still miss ya buddy... @ least I can use your experience and pass it as information for others.
For what effect do you wish to do them separately, is there a HR angle here I'm missing? I work in HR so please enlighten me if this is what you're shooting for (ahh, shit no pun intended). Curious, not judgmental. Thanks.