Saving PDF with Javascript does not Compress the PDF

To make life easier for our users we have created a button in Adobe that allows the user to save the file in a shared drive with a single click.   

// checkFD function checks to make sure the user has access to the shared drive
function checkFD(){

	var checkd = false;
	var checkn = false;

	app.beginPriv();

	try{
//checks for the file		
this.importDataObject("myFile", "/192.168.3.57/checkthisfile.txt");
		var myData = this.getDataObject("myFile");
	}catch(e){
//alerts user if the shared drive is not found
		app.alert("F Drive not found, please establish VPN connection to office before using button.");
		app.endPriv();
		return;
	}

	while (checkd == false){
//it asks the user to enter two parameters for the file name - deal number and document name
		var d = app.response("Enter Deal Number:", "Enter Deal Number", "");			
		if (d && d.length > 0){
			var temp = d.replace(/[|&*;$%@"<>+,]/g, "");
			if (temp.length != d.length){
// it checks for special characters
				app.alert("Special characters detected, please do not use symbols such as |&*;$%@<>+,.");
			}else{
				checkd = true;	
			}
		}else if (d == ""){
// it checks if the user entered blank
			app.alert("No Deal Number was entered.");
		}else if (d == null){
			//cancel
			checkd = true;
			app.endPriv();
			return;
		}
	}

	while (checkn == false){
		var n = app.response("Enter Document Name:", "Enter Document Name", "");	
		if (n && n.length > 0){
			var temp = n.replace(/[|&*;$%@"<>+,]/g, "");			
			if (temp.length != n.length){
				app.alert("Speical characters detected, please do not use symbols such as |&*;$%@<>+,.");
			}else{
				checkn = true;	
			}
		}else if (n == ""){
			app.alert("Please enter valid Document Name.");
		}else if (n == null){
			//cancel
			checkn = true;
			app.endPriv();
			return;
		}
	}
	
	try{
// it calls the savePDF fucntion if all conditions are met
		savePDF(d, n);
	}catch (e){
		app.alert("Folder not found, please ensure Folder exists on F Drive.");
		app.endPriv();
		return;
	}
	app.endPriv();
}

function savePDF(d, n){
//it renames the file with the parameters
	var fname = n + "-" + d + ".pdf";
	var dr = d.substring(0,2);
	
	if (dr == "DR"){
//if the file starts with the letters DR it saves them here
		var fpath = "/c/testpdf/DR/" + d + "/" + fname;
	}else{
//if the file doesn't start with DR it saves them here
		var fpath = "/c/testpdf/Existing/" + d + "/" + fname;
	}	
// it saves the file to the shared drive
	this.saveAs(fpath);	
}
//Un-Comment this to enable Console Menu Item (For Debugging)
//app.addMenuItem({cName:"Console Window", cParent:"View", cExec:"console.show()"});
app.addMenuItem({cName:"Save to F Drive", cParent:"File", nPos:9, cExec:"checkFD()"});

//Doesn't work for current versions of DC
//app.addToolButton({cName:"myButton", cToolText:"Save to F Drive", cExec:"checkFD()"});

  However, when using the SaveAs command we realize it isn't compressing the PDF like just a normal Save in Acrobat would do - so for example a file saved through the normal adobe Save As script is about 850KB - a file saved through my javascript above is about 34MB. 

are there any JS commands that will compress the file as it is being saved?

Thanks

Shane Kelly