Hi!
Let's settle one thing first!
5 or 15% nitro isn't going to revolutionize your engine starting. However 5-10% nitro will make your engine run better and slightly improve engine starting once you know how to start a glow engine.
But first you have to use the right starting technique.

1. Use an electric starter....I know that flipping prop by hand is one way of doing it, I learned that way myself, but an electric starter will make starting easier.
2. Use adequate battery power...that is 12V, 10A motorcycle battery and a automatic glow-driver. Never ever trust a small 1,2V NiCad igniter, they have not enough power when cranking a hard to start engine.
3. Have the tank placed according to the tank rule...and do use a Uni-flow set up with two clunks.
4. Use an aluminum spinner nut...Not a cheap plastic spinner.
...Then start your engine at idle...this means having the throttle open approximately 2mm open from fully closed.
As soon as the engine has fired, fully open the throttle and adjust the engine for slightly rich setting with the high speed needle. That's it!

...A pump is not needed!!! (or wanted). It's all about starting technique.