This is quite common with all 1-2 conversions of all brands due to the 30 degree caster angle (rake) on the front end. Offset trees will help as they drop the trail from 5+ inches to about 2 but the rake or caster cannot be changed without cutting the frame.I have a 2007 wing with a 2015 Roadsmith Trike Kit. One of my big problems was the pulling to the right and I see that on here a lot.
2-1 trikes like CanAm don't have this issue as the caster (rake) is 2-3 degrees and trail is around 1/2 inch vs the 2-5 inches on a 1-2. While the CanAm and other 2-1 trikes will tend to follow the road crown also the required user input from the rider is close to zero as the pull is almost unnoticeable and can only be realized when the hands are off the bars where the bike will very slowly drift to the right.
Learning curve is also in the 100 miles or a couple hours less if you have ridden snowmobiles or ATV as the feel is similar. The handling and physical effort required even in the twisties is about on par with a 2 wheeler and after a long day you will be refreshed and ready for tomorrow.
Tomorrow I am taking a buddy for his very first Trike ride on one of my reverse trikes. He is a snowmobiler so I told him we will be going on a 250 run through one of our more twisty areas. You have 10 minutes to adjust. I am sure he will. :-)