Bennetts are not fast by any means, but that sounds slow. Depending on the temp, the fluid will be thicker and will move slower. You can try a thinner oil, but first contact Bennett directly.
http://www.bennetttrimtabs.com/
Bennett Marine's Client Services department may be reached from
8:00 AM - 5:00 PM Eastern Time Monday - Friday
Phone: (954) 427-1400
Fax: (954) 480-2897
BENNETT MARINE
550 Jim Moran Boulevard
Deerfield Beach, Florida 33442, U.S.A.
Call and ask to speak with MJ Thomas. He is very knowledgeable and Bennett sets the standard for customer service in the Marine Industry. Seriously, they stand behind their product 200% and will bend over backwards to make it right. All Bennett products have a 5 year warranty which you should still be within. MJ does post here on OSO on rare occasion.
Call them first.