I'm flying an Inspire 2 typically with either a 15mm or 45mm lens. I already purchased and use a bunch of Formatt Hightech Firecrest ND filters (IRND). Couple of questions: I'm looking to add a Polarizer into the mix. It really is a must-have. Can I stack a second Firecrest Filter (that would be the Polarizer) to either of the above mentioned lenses without any balance / gimbal issues? Which Polarizer would you recommend?