Several years ago, I was given a set of Pen Turning Chisels, and I found that they were Too Light for my liking.
I prefer to use full size, full weight Chisels, and Handles. Their Mass, keeps them solidly on the tool rest and their section size prevents them from Chattering and Flexing.
By maintaining their Sharpness, they cut easily in the required position and direction.
The standard length of the Handles and Chisel, means that I can hold the Chisel, at the side of my body, and with just a sway of moving my body, I can traverse the pen blank.
Also I taught myself, by plenty of repetition, to be able to turn left handed as well as my natural right handed, this I found to be of great benefit working in the relatively confined area of a Pen Blank, and using Full Sized Chisels.
I virtually only use a Roughing Gouge, and Skew Chisel, for all materials with my Pen Turning and on Rare Occasions, I may use a Detail Gouge.
Brian.