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As Clint points out, you may have the Deviation set to "Narrow" +/-2.5KHz instead of the default "Wide" +/-5KHz. See manual page 62.

The other possibility is the FT-60R Mic socket itself.
It is notorious for "spitting out" speaker/mic connectors. Elastic bands are one solution as mentioned elsewhere. That is what I currently use:-)
I also had many hours of hair-tearing frustration trying to get Chirp to connect via an after market programming lead.

The problem is the inside diameter of the recess at the connector is too small for the majority of (industry standard?) connector shells.
This results in the plug not fully seating, resulting in the connector contacts actually pushing the plug out instead of locking it in.

In my case with the programming lead, I carefully filled the moulded plastic body down to fit into the recess. That all works now.

In the case of the Heil mic, it could be that the connector body is fouling on the recess, preventing proper insertion of the plug.
Measure the mic plug body and the recess with a pair of vernier calipers to see if it will actually fit correctly.

A more universal fix would be to make up a Forstner type drill bit to ease out the connector recess in the FT-60R to the bigger "industry standard" diameter.
The difference is subtle, probably something like 6mm versus 1/4". Sorry, my calipers are in the shed, it is late at night here and it is bucketing down with rain.

HTH someone...Bob VK2ZRE