Loading a .Txt Delimited source, the max Rows hit a 244,265 limit, when the file has around 330K.

Interesting, and clever thinking on the workround. I've never seen that happen. I would think a delimiter is missing. If you did split by position, I wonder if a space (char 32) is really a non-breaking space (char 160). Visually you cannot tell. And if splitting by position it won't matter, but if it is parsing based on using a space as a delimiter, it won't work, and may cause the issue you see.

Also weird that NotePad++ woudn't open it. I opened that 1.5M record fake credit card data on my machine in less than 3 seconds, but that file has very few fields, only 139MB. Your file might be larger even though it has fewer records.