VIM, how to prevent indent on next comment line (Tcl file mode) - vim

Question

When I type a comment in my Tcl code, like so:
# Foo
And then hit Enter, I get this:
# Foo<Enter>
# <cursor_here_now>
I want it to do this instead:
# Foo<Enter>
# <cursor_here_now>
Or:
# Foo<Enter>
# <cursor_here_now>
Relevant .vimrc settings:
filetype on
filetype plugin on
filetype indent on
set autoindent
set textwidth=0
set expandtab
set tabstop=2
set softtabstop=2
set shiftwidth=2
set shiftround
I don't want to disable anything that I presently have. I just want to change the way comment indenting works. Honestly, I can't imagine why anyone would want it the way it works now. Wouldn't everyone want the next comment line to start in the same column as the previous one??
I have Googled a lot and tried a lot of combinations of formatoptions, autoindent, smartindent. I have consulted web pages such as: http://vim.wikia.com/wiki/Indenting_source_code#File-type_based_indentation
But so far, nothing I try is stopping this weird behavior.
Thanks!
--Myles
PS VIM version 8.1.1. More details requested on version. Adding here.
VIM - Vi IMproved 8.1 (2018 May 18, compiled Jun 19 2018 04:05:25)
Included patches: 1
Compiled by matrix#vlsj-ctrh65
Huge version with GTK2 GUI. Features included (+) or not (-):
+acl +farsi +mouse_sgr -tag_any_white
+arabic +file_in_path -mouse_sysmouse -tcl
+autocmd +find_in_path +mouse_urxvt +termguicolors
-autoservername +float +mouse_xterm +terminal
+balloon_eval +folding +multi_byte +terminfo
+balloon_eval_term -footer +multi_lang +termresponse
+browse +fork() -mzscheme +textobjects
++builtin_terms +gettext +netbeans_intg +timers
+byte_offset -hangul_input +num64 +title
+channel +iconv +packages +toolbar
+cindent +insert_expand +path_extra +user_commands
+clientserver +job -perl +vertsplit
+clipboard +jumplist +persistent_undo +virtualedit
+cmdline_compl +keymap +postscript +visual
+cmdline_hist +lambda +printer +visualextra
+cmdline_info +langmap +profile +viminfo
+comments +libcall +python +vreplace
+conceal +linebreak -python3 +wildignore
+cryptv +lispindent +quickfix +wildmenu
+cscope +listcmds +reltime +windows
+cursorbind +localmap +rightleft +writebackup
+cursorshape -lua -ruby +X11
+dialog_con_gui +menu +scrollbind -xfontset
+diff +mksession +signs +xim
+digraphs +modify_fname +smartindent +xpm
+dnd +mouse +startuptime +xsmp_interact
-ebcdic +mouseshape +statusline +xterm_clipboard
+emacs_tags +mouse_dec -sun_workshop -xterm_save
+eval -mouse_gpm +syntax
+ex_extra -mouse_jsbterm +tag_binary
+extra_search +mouse_netterm +tag_old_static
system vimrc file: "$VIM/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
system gvimrc file: "$VIM/gvimrc"
user gvimrc file: "$HOME/.gvimrc"
2nd user gvimrc file: "~/.vim/gvimrc"
defaults file: "$VIMRUNTIME/defaults.vim"
system menu file: "$VIMRUNTIME/menu.vim"
fall-back for $VIM: "/grid/common/pkgs/vim/v8.1/share/vim"
Compilation: gcc -std=gnu99 -c -I. -Iproto -DHAVE_CONFIG_H -DFEAT_GUI_GTK -pthread -I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng12 -g -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -std=gnu99 -L/usr/local/lib -Wl,--as-needed -o vim -pthread -lgtk-x11-2.0 -lgdk-x11-2.0 -latk-1.0 -lgio-2.0 -lpangoft2-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lcairo -lpango-1.0 -lfreetype -lfontconfig -lgobject-2.0 -lgmodule-2.0 -lgthread-2.0 -lrt -lglib-2.0 -lSM -lICE -lXpm -lXt -lX11 -lXdmcp -lSM -lICE -lm -ltinfo -lelf -lnsl -lselinux -lacl -lattr -L/grid/common/pkgs/python/v2.7.6/lib/python2.7/config -lpython2.7 -lpthread -ldl -lutil -lm -Xlinker -export-dynamic