I don't understand a few points. Care to explain?
You're 28. At your level you use only 30 cannons? ONLY 4 ice walls??
I'll assume that you use the blaster to get through the code gates. But what about those nodes which are surrounded by atleast 2 upgraded turrets. Especially if the node is a scanner. You can't defend that with 2 ice walls, can you?
At my level (15), I use around 30 cannons and 8 walls. 1 data leech. And 2 rams, 1 for each code gate. I usually find 2 code gates in all networks. Sometimes even a few shurikens.
How do you even find people below your level?
How to defend against krakens?
My beams are level 9. I was able to take down any code gate with ease using 3 beams if code gates were level 7 or under. Also if the core was past the code gate, krakens would also speed up the process.