Yes you will need Vsync, otherwise you'll get that bending affect you are seeing. Also be sure to leave some empty space (0.4 volt black level) of at least 3 scanlines before and after (more is better if it doesn't limit the viewable height of your bars). This is kinda like the front and back porch of the Vsync pulse.
Speaking of which, are your front and back porch adaquate for your Hsync? If you look at the diagram below you will see that you need to maintain at least 1.5 usec of space for the front porch, and about 4.7 usec on the backporch of the Hsync. To be safe, and because most TV's have considerable overscan, I would give it more (figure on only having about 48 usec of viewable active video, the rest just wraps around the CRT).
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=627&stc=1&d=1132554180 ">
For now don't worry about the colorburst, since I presume you are only fooling around with B&W. Also if you didn't already notice, IRE units are the same as volts*100.
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