Topband: 160M Balun

[N2TK, Tony]

I shunt feed my tower for Topband. Presently using a Comtek 100 bead balun.
After reading K9YC's article on baluns it would seem that a stack of five
#31 cores with 7 turns of coax would be a better balun.
Would I notice an improvement in any way by switching baluns? 
If the answer is I would notice an improvement what about using sixteen
turns #12 THHN wire on  #31 core as shown in K9YC's article? How many cores
would I need for 1500W?
Tnx for any feedback
N2TK, Tony