My pleasure. :) (And I love the form Kersti (SHESH-ti, of course) even more!)
This rule sometimes make loan words troublesome. Ketchup is said with a hard k, while kilo is SHEE-lo, and whether kex ("biscuit, cracker", a loan from the English word "cakes") should be pronounced "kex" or "shex" is an ever raging debate (seriously!). I'm on "Team shex"!