find the index of the last layer from a specific group of layers

So what I'm trying to do is have a shape layer fit certain text sizes with padding and the like. I've got code on the text to arrange itself vertically depending on their index order and align themselves depending on the width of the text layers. Using a drop down they align right, left and center. The problem I'm coming across is the shape layer adds a little extra on the bottom after it calculates the heights, padding and the extra space from in between the text layers. Also, i'm specifically targeting certain layers and not all layers.

I have a feeling eithr the math is off in the gaps or I need to find the last keyword index and take the height of just that one. I'm not sure.

Here's the code for the shape layer:

// Variables

var keyword = "Text";

var srt = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Duration [ IN, OUT ]")[0];

var textListWidth = [];

var yy = 0;

var paddingX = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Padding X") *2;

var paddingY = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Padding Y") *2;

// For loop for Array width & height

for(i = 1; i <= thisComp.numLayers; i++){

  layerPath = thisComp.layer(i);

  layerWidth = layerPath.sourceRectAtTime(srt).width;

  layerHeight = layerPath.sourceRectAtTime(srt).height*1.5;

  if(layerPath.name.match(keyword)) {

    textListWidth.push(layerWidth);

    yy += layerHeight;

  }

}

// Variables for max width & total height

x = Math.max.apply(null, textListWidth) + paddingX;

y = yy + paddingY;

// function

[x, y]

Here's the code in the position of the text layers:

// Variables

var controlsX = thisComp.layer("CONTROLS").transform.xPosition;

var controlsY = thisComp.layer("CONTROLS").transform.yPosition;

var paddingX = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Padding X");

var dropAlignText = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Text Alignment");

var alignTextArr = [1,2,3];

var alignText = alignTextArr[dropAlignText - 2];

var keyword = "Text";

var srt = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Duration [ IN, OUT ]")[0];

var textListWidth = [];

var paddingX = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Padding X");

var paddingY = thisComp.layer("CONTROLS").effect("Basic Lower Thirds")("Padding Y");

var prevLayer = thisComp.layer(index -1);

// For loop for Array width & height

for(i = 1; i <= thisComp.numLayers; i++){

  layerPath = thisComp.layer(i);

  layerWidth = layerPath.sourceRectAtTime(srt).width;

  layerHeight = layerPath.sourceRectAtTime(srt).height;

  if(layerPath.name.match(keyword)) {textListWidth.push(layerWidth);}

}

// Variables for max width & total height

xW = Math.max.apply(null, textListWidth);

// Funtion Boolean Text Alignment

if (xW > thisLayer.sourceRectAtTime(srt).width) {

if (alignText == 1) { x = (controlsX + paddingX) + thisLayer.sourceRectAtTime(srt).width/2;}

if (alignText == 2) { x = (controlsX + paddingX) + xW/2;}

else if (alignText == 3) { x = (controlsX + paddingX) + xW - (thisLayer.sourceRectAtTime(srt).width/2);}

} else { x = thisLayer.sourceRectAtTime(srt).width/2 + controlsX + paddingX;}

// Funtion Boolean find if layer above is a text layer

if (prevLayer.name.match(keyword))

{ y = prevLayer.sourceRectAtTime(srt).height/2 + thisLayer.sourceRectAtTime(srt).height + prevLayer.position[1];} 

else { y= controlsY + thisLayer.sourceRectAtTime(srt).height/2 + paddingY; }

// function

[x,y]

I've also included the screenshot. Any help is appreciated.