I'm no expert here, but I've formulated a crosswind theory based on my
personal
observations of the following tires:

Nokian Hakkapelitta 10 184R14 D
Michelin LTX 195/75R14 C
Uniroyal Laredo 195/75R14 C
Michelin MXT 205/70R14 R

The worst crosswind performance was observed with the 185's - constant
corrections required on windy days. The two 195's performed comparably, and
were a marked improvement over the 185's, yet the little causeway into
Portland still wasn't pleasant on a windy day. The 205 - my current tire -
has virtually eliminated the effects of crosswinds.

Since your previous tire - a Pirelli 6000 non-reinforced 205 mm passenger
tire - offered better crosswind performance than the 195 mm Yokohamas,
one would conclude that sidewall reinforcement was not a contributing
factor.
The variables in your crosswind equation would be tread design and tread
width, as these seem to be the major differences between the tires you
are comparing.

Combining our observations - since I did not see any noticeable difference
in crosswind performance between the two 195 mm tires - both with
significantly different tread patterns - it would seem that the only
remaining factor influencing crosswind performance would be tread width.

Of course wider tires have their drawbacks in other conditions, but it
would seem that for dry pavement crosswinds wider would be better.

Differing opinions are of course welcome...

Doug Fitz-Randolph
Yarmouth, ME
'90 Syncro