No problems with cracking on mine after 120 flights. Mostly soft landings with one exception that resulted in some very minor bulging at the fuse sides in the area of the landing gear plate.

They are nose heavy with the YS170/Short pipe combination so you have to use a light spinner, wheels, wheel pants and place your rx pack down the turtle deck as far as you can reach. If that is done you should be able to achieve 167 with no tail weight. Mine is at 175 with 1/2 oz in the tail.

The weight of the landing gear is quite variable so if you got a very heavy pair you may not be able to achieve your cg target. Weigh them and replace them if they are too heavy. That would be far better than adding a bunch of lead to the tail.

Colin.