Stoked for you. The Machete is a Killer board. What is your foot size (it is impossible to make a solid board suggestion without knowing foot size).
Weight-wise, you are best centerred on the 160 which ride suggests for 140 to 190 lbs. Low rize rocker is very fun, but it reduces contact length a lot, so you get boards that ride very short. That is why Ride has you (weight based) as a better fit on the 162 than the 158.
If you went with the 158, you would lose almost 2 cm of Effective edge in comparison to your T6 159, but you would lose almost 4 cm of contact length. Only the 162 Machete will have as much contact length as your current 159.