You're kind of toast. By default, DH+ is only 57kbits/second. If all of your hardware is compatible, you can select 230k, but it is still a tiny fraction of the bandwidth available to the slowest ethernet processor. RSLogix is a bandwidth hog -- any programming activity will crush your comms.
A short-term fix for some would be to swap the 5/04 for a 5/05, using the DHRIO bridge in the Logix chassis to maintain messaging access from the DH+ devices to the new Ethernet devices. When you do that, do check your comm throttles in your status file:
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