Eucalyptus bark breaks down (decomposes) much faster than pine or other conifer bark so it wouldn't be my first choice to add to a potting soil. Neither would mushroom compost or vermiculite, as both tend to compromise the fast drainage and proper aeration container plants require.

My initial opinion of your mix is that it will be too dense, too easily compacted and therefore too water retentive.

Have you read up on the potting mixes most often recommended on this forum and more specifically, in this thread? That's where I'd start :-)