You waited TWICE the amount of time I did - at 90 days - that's 3 months - I only waited 6 weeks - half the time you did...
At the time of my implant - over 4 years ago - 90 days was the norm. About 2 years ago Cochlear changed their equipment - and I think Oticon followed suit. The equipment is now made of different material - it's closer to what is used for dental implants - and the wait time has been reduced to 6 weeks.
However, many docs don't think 6 weeks is enough (my doc included, last time I talked to him) so they are choosing to go with the more conservative 90 days.
I am not an audiologist, nor am I an Oticon rep, but I've never heard that an abutment that lacked a "snug" fit created a volume issue. I'm not saying they are wrong, just that I've never heard of this. I do know that if your processor sits too close to your skull, not enough air will flow underneath it and it won't work properly.
Regardless, I hope time solves your issue.
Fingers crossed,
Jan