RE: From F175 (2001) to F161 (2007): What can be expected?
Not an expert, but I moved from the 175 to the 147 and then to the 160.
There is a HUGE difference between the 175 and the newer boards. Performance wise, the newer boards do everything better than the 175. The biggest difference in my mind is that the longer 175 had a big problem sticking its nose on the backs of waves on down wind runs. Getting tossed over the front was pretty easy to do. Now, they just keep going faster and faster without sticking.
Control is better on all points of sail. However, the 160 & 161 are pretty big for your size and with enough speed and a 70cm fin, the board can take off in strong winds. A smaller fin, and mast base placement are critical, plus downward pressue on your booms is important to keep you from flying on a beam reach or upwind beat.
It can be very scary on fast downwind runs, but it is because of the potential speed. It takes practice to get use to it. The board does exceptionally well, it's the sailor that has to develop the confidence.
If you are overpowered, just keep changing down to smaller sails. The pros never go below 9.0, but us mortals do what is necessary. I have gone down to as small as a 6.5 in 25 to 30 knots. I am not skilled enough to manage a big sail in that kind of wind.
Jibing? Frankly, I don't remember how the 175 turned, The 160 does fine, just a bigger step across to the other rail.
Formula 160; iSonic 111; HiFly Move 105; Tiga 263; '85 Mistral Superlight.
Maui Sails TR 11.0; 9.2; 8.4; 7.6; 6.6; Maui Sails Switch 6.0; 5.2; Maui Sails Global 4.5; 4.0.