I shoot a farter so things may apply differently...I notice a shaft on my 970 cyranos that extends abit out of the barrel say 5cm shoots straight on, the shaft I normally shoot extends 22cm and has a tendency to shoot a bit high, which I now prefer (that it shoot a bit high) I like the extra leverage the long shaft applies when hussling fish.
As for the situation of your flopper...in my set up I use a 7x7...that is I have all my tips made to be- 7cm of point and 7cm of flopper, I think more often a short distance b/t flopper and point is what loses fish more so than a "too" short flopper, plenty of guys that have used these tips have seldom if ever lost any fish...the only drawback is the shaft needs to penetrate about 14cm to engage...I will add I use this set up for hole punching to and have had excellent results...I would suggest if anything you go with about a 4cm flopper but bring it down to about 6-7 from the tip...that should increase you stringers weight...my 2 cuban centavos
