Adding up to 20% of Reserve days into VTOs doesn't result in more Reserve Days in the bidpack.
There are X pilots in the bidpack. Company establishes Y hours of flying with a BLG target of Z. Company also establishes best guess at VTO numbers w/the remainder of the bidpack being Reserve lines. VTO lines intended to cover Vacation\training conflicts for both line holders and reserve line holders.
Adding more VTO lines doesn't somehow magically increase the number of R days during the bid month