I have a medallion with the aluminum pocket base. When I am getting rowdy or tying a long- shanked fly I sometimes tip the vice forward or to the forward/side. I like the aluminum base because it is light-ish and sometimes I like to tie on our porch, or elsewhere. Does anyone else have the same issue or do I just pull the thread and materials around too much? Is the bronze base (the rectangular one not the pocket one) noticably less tippy?