If she can make it on her own after you split up the joint bills then I agree with your assessment. If she can make it on her own but you pick up more of the bills then that could work to.
I took on the majority of our bills and ended up giving my EW an additional $300/mth. I could have split the bills 50/50, made her pay for the car she was driving, etc. but then I would have had to give her more money. So we agreed that I would pay more of the bills and give her less money. We each had the same spending money allowance each week, the same grocery allowance, etc. That way one person didn't feel like they were getting the hose job.
We also split our saving account in 1/2 at the time as well. I kept bank statement of the before and after for my records.
We are now D'd and the arrangement during this time period had no bearing on what was put into our D decree.
