DHCP manual bindings/reservations don't work when using hardware-address

We have used manual bindings in a limited fashion and can assign them fine if we use the "client-identifier" as the matching criteria; The problem is we need to expand our usage of them but don't want to depend on the client machines having a properly filled in "dhcp client-id" field. The problem is we cannot get manual bindings to assign using simply the hardware-address / MAC address.
Here is the config we are using:
ip dhcp pool res_test
host 10.2.17.80 255.255.255.0
hardware-address 5c96.9d74.efa7
default-router 10.2.17.1
dns-server 10.2.17.14 10.2.17.113
domain-name ardemgaz.com
netbios-name-server 10.2.17.14 10.2.17.113
And here is what the DHCP table looks like:
show ip dhcp binding
10.2.17.80 5c96.9d74.efa7 Infinite Manual
10.2.17.193 015c.969d.74ef.a7 Dec 04 2014 08:40 PM Automatic
You see that the client got the address 10.2.17.193 but should have received 10.2.17.80; We have tried including the "Ethernet" prefix of 01 in the hardware-address using this config:
ip dhcp pool res_test
host 10.2.17.80 255.255.255.0
hardware-address 015c.969d.74ef.a7
default-router 10.2.17.1
dns-server 10.2.17.14 10.2.17.113
domain-name ardemgaz.com
netbios-name-server 10.2.17.14 10.2.17.113
But then you get the following, after clearing the binding and renewing the lease from the client:
show ip dhcp binding
10.2.17.80 015c.969d.74ef.a7 Infinite Manual
10.2.17.193 015c.969d.74ef.a7 Dec 04 2014 08:50 PM Automatic
Which makes no sense to me. Is it even possible to specify the MAC address to receive a manual binding? This is using the following version:
show ver
Cisco Internetwork Operating System Software
IOS (tm) MSFC Software (C6MSFC-JSV-M), Version 12.1(27b)E1, RELEASE SOFTWARE (fc2)

The IOS DHCP server is going to use the client identifier if one is present and will only fall back on the MAC address if one isn't present. I've been working with these devices for years and still haven't found a way to create a universal reservation that will work for both client identifiers and MAC addresses. At this point, I usually fall back to a server-based DHCP solution that has this flexibility and configure a DHCP relay on the switch.

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