Margo real calfskin heads can be pretty tempermental. Unless you are really, really particular about having calfskin, I think a mylar fibre skin synthetic type head would do you fine.
There is an Elite banjo head that has the look of vintage calfskin, without the vintage shrinkage.
Here is the advertisment:
'Elite banjo heads feature a modern material with the feel and appearance of calfskin, for a warm old-time sound. Unlike a calfskin, the Elite is unaffected by moisture - no shrinkage, stretching or splitting due to humidity'
Make sure before ordering a banjo head you measure for correct diameter and crown height of your banjo
Stewart Macdonald's Guitar Shop Supply is a great place to order stuff. 800-848-2273
They will send you a free catalog

Sorry folks I haven't come across any good recipes for a mylar fibre skin heads.

Bonnie