I'm sure the glass contributed to the weight. It's a nose weight challenged plane even when the tail is light. The heavy duty Sierra tail wheel retract is also quite heavy, and requires a bunch of nose weight to compensate. The smaller 1/5 Sierra tail wheel is lighter, but because of the small 4-40 shaft size it will bend if there is a side load applied to it.
Surprisingly it flies fine at that weight, but that's usually the case when you do everything perfect. It will be very unforgiving if I make a mistake. It makes it even worse that I'm used to the lighter 190. I have to keep in mind that Tank's Tank (as I call it) will not be happy if I slow it down too much on landing. It sure looks sweet on the ground. Hopefully it will last a while.