How to connect to 30 awg Nichrome wire to 28 awg wire?
Is this for a high temp situation where solder might melt? What was suboptimal for your crimp?  Reliability?

You could spot weld them like a thermocouple.
 http://www.sunstonespotwelders.com/spot-welder-200ws-single-pulse.php might handle wires that small.  Another options might be simple screw terminals.