I think there is something that suggests to right handers that a rh magazine load ought to be the natural way to go. For many I'm sure this is right but like the Op I found a LH magazine was best. I've never regretted it and find that holding the rifle naturally in my right arm leaves my left hand free to rotate the magazine. That said it really is a case of switching hands for cocking ,loading and aiming and one just gets used to whichever hand kit you buy.
A word of caution, Rowan mags do not seem to like short pellets eg JSB Exact Express compared with standard Exacts. The pellet is head heavy and can tumble when inserting and being hidden from view it is rammed into the breech. Whilst putting a rod down to clear a jammed pellet is simple with non magazine rifles the Rowan gets blocked and the whole thing has to be removed as you cannot slide out the jammed magazine.
A Wickes 4mm ali rod works wonders for clearing jammed pellets but round off the leading end very slightly as they can be sharp enough to damage the breech seal.