You just need some models to look at/dissect you can use mine.
I use 4nec2 it's free and more powerful than any other modeling program I've found pretty user friendly to.

http://ghz24.freeshell.org/antenna/models/elevenmeter/
There are other antennas in the parent folder.
The link to your model is down if you send it to me or post it I'll take a look.
Here is a pretty nice LPDA I can't take credit for it though.
It demonstrates proper feeding of an LPDA

CM 8 ELEMENT LPDA by "old sparks"

CM 470-810 MHz

CE

GW 1 21 0 -0.158 0 0 0.158 0 0.00081

GW 2 21 0.055 -0.141 0 0.055 0.141 0 0.00081

GW 3 19 0.104 -0.126 0 0.104 0.126 0 0.00081

GW 4 17 0.147 -0.113 0 0.147 0.113 0 0.00081

GW 5 17 0.186 -0.101 0 0.186 0.101 0 0.00081

GW 6 15 0.221 -0.090 0 0.221 0.090 0 0.00081

GW 7 15 0.252 -0.080 0 0.252 0.080 0 0.00081

GW 8 13 0.280 -0.072 0 0.280 0.072 0 0.00081

GE 0 0 0.

EX 0 8 7 00 1. 0.

FR 0, 96, 0,0, 470, 5

PT -1

TL 1 11 2 11 -125 0. 0. 0. 0. 0.

TL 2 11 3 10 -125 0. 0. 0. 0. 0.

TL 3 10 4 9 -125 0. 0. 0. 0. 0.

TL 4 9 5 9 -125 0. 0. 0. 0. 0.

TL 5 9 6 8 -125 0. 0. 0. 0. 0.

TL 6 8 7 8 -125 0. 0. 0. 0. 0.

TL 7 8 8 7 -125 0. 0. 0. 0. 0.

RP 0 1 10 1510 90. 0. 0. 20. 0. 0.

EN