if you are starting from scratch, put a base coat on the boot (just smear a thick layer of polish on the boot and let it dry). this clogs the pores of the leather so it will make it smooth and shine well when you use the method you are currently using.
you could also try smushing a very small bit of polish, to release the oils in it (that gives the shine, but doenst blacken), and put that on as you come close to the final coats on the boot. make sure you use all the mashed up polish that you crushed, other wise it is usless in a few hours because all the oils have dried up.
the alternative is when you are on your knees desperate, and this is cheating, but you could try a "burn shine". you cover your boot with a thick layer of polish that hasnt been worked in. then you take a lighter, (making sure that you dont touch the boot with the flame you actually dont want to BURN it, just melt it) melt the polish, and be sure not to stop over one area for more than a second, then let cool. then after that you use the method you used before. HOWEVER, DO NOT DO THIS TOO OFTEN! the oil will dry up and the polish will crack off your boot, and if you do it wrong you can ruin your boots. if you do as follows properly, you will be able to see between your teeth when you smile in the reflection of your boot. good luck.