LT1302 Boost converter, efficiency issue

I am using the LT1302CN8-5#PBF, boost converter.

I have built exactly same circuit as the first page of the following datasheet document is presenting.

Components I used:

  • 100uF cap : ESL107M050AGMAA
  • 10uH Inductor : RLB0608-100KL 
  • Diode : 1N5819
  • 0.1uF cap: Ceramic disc capacitor. Unknown part number.
  • 0.01uF cap: Ceramic disc capacitor. Unknown part number.
  • 20K ohm resistor : Unknown part number.

My input voltage is 3.7V and max input current is 5A. 

When testing with DC electronic load, the boost converter circuit output voltage starts to drop below 5V when current output is only 125mA.

My target output current is 300mA, but then the voltage output will drop below 3V

The testing result is very far from what I read from the datasheet document and the LtSpice simulation. What could be the issue?

Thank you for your help.