I'm on 230/100s w/e99 turbo, 34's 3.73 and mine also is doing a lot better than I thought it would. Like you said towing runs a little hot so I was thinking about adding some water injection and keeping this little charger til it gives up
I know the JW valve bodies that you buy from the vendors are setup for the tuner to add the line pressure desired. I tried the php "modified vb." tune and it shifted very soft and slow.