Darmoose, there is no specific rule covering this in either WPA, or BCAPL/CSI, except for their general rule writings of double hit and push shot which leaves room for interpretations, judgment, tangent line, and so forth.
In DCC the rule is when the cb is either frozen to or close to an object ball then the cue must be elevated at a 45 degree angle when executing these shots or it will be considered a foul, and not a foul if the cue is elevated. Conclusion; not a foul under DCC rules. This is the lowest standard of play possible. But it does effect OP, for when the cb is close to the stack or anywhere then the cue most be elevated 45 degrees or more, otherwise it is an automatic foul!
* I should add, this also allows a player to push or double hit the cb and bury it within the stack as long as you elevate the cue, wow, this really lowers the standard of play!!!!
In '08 I tried to get bcapl to adopt this, plus my explanatory diagram: Just imagine that if they would of adopted my foul criteria, we would not be having this discussion!
CLOSE PROXIMITY BALL / FOUL CRITERIA;
When an intended or an otherwise to be contacted object ball is in close proximity of the cue ball then one must be aware that a push shot foul or a double hit foul may occur.
1. When stroking the cue ball with draw directly towards a very close proximity object ball then the cue ball can not go forwards past the contact point, or it will be a foul. (foul criteria)
2. When stoking the cue ball with follow directly towards a very close proximity object ball then the cue ball must pause at the contact point before proceeding to follow, or it will be a foul. (foul criteria).
3. Regarding foul criteria line 1 and 2, if these shots are attempted with an elevated cue ( such as a masse draw or a force follow) then the same foul criteria applies.
4. The above criteria are based upon the cue ball remaining upon the bed of the table when stroked. The cue ball is not elevated into the object ball.
This is the basics, there is more concerning a close proximity shot that is angled. Then the tangent line comes into play, at least when stroked upon less than a 45 degree angle.
An object ball stroked at 45 or greater angle can not be double hit or pushed for the balls go separate ways at 90 degrees or more upon contact. Under 45 degrees then yes based upon how close the object ball is to the cue ball.
Simply put; the cb must initially follow the tangent until the english takes over, but if it initially goes forward of the tangent line it is a foul. There is more, but this gets us there.
The close proximity shot is the most beguiled, misunderstood billiard discipline in all of pool, and it has been that way forever! I learned this foul criteria from Ceuleman back in '69.
Without this foul criteria clearly depicted then players are truly lost as to the proper ruling, and are truly playing by a low standard of play, really ugly play, actually!!!!
I wish OP.org would develop and adopt their own general rules so this continuing bewilderment about rules cease to come up all the time, and has somewhat of an end in site! Whitey