Yes, I thought the 3.38 might have been a typo. Cool find.
Tires shorter than your 32 inch ones will help reduce the lugging problem. Taller ones will only make it worse.
Selecting shorter tires will probably have more of an impact than cam selection. Combining shorter tires with a cam which gives you maximum torque in the RPM range which you are having lugging issues would be where your focus should be. With the 3.38 gears, I am guessing that the lugging starts at 2,000-2,500 range?
Like they say, "no such thing as free lunch." You can't have awesome highway speeds AND not have lugging issues.
