When you fish with redfins, keep both 7" and 5" with you. Throw many different colors. Rainbow trout and bone are great colors.
The most important thing is throw it as far as you can, and WAKE the redfin all the way to your feet, not below the surface. Make sure the redfin is PUSHING a wake.
Another trick is take all hooks and split rings off the redfin. heat a needle up, poke a hole in the redfin, I put the hole in the black dot on the side of the redfin. Use a syringe to "load" the redfin, I use mineral oil, until the 7" redfin weighs 1 ounce and load the 5" redfin until it weighs .5 ounce. use super glue and a toothpick to seal the hole. trim the toothpick and super glue over that.
Put heavy duity split rings and 4x strong gamakatsu hooks on the redfin. I leave the middle hook off of the 5" redfin.
You will be able to throw the redfin a long ways, makes a huge difference with 5", and they will still wake. "Waking" the redfin is important and if the fish blow up, push the bait, etc. KEEP waking the redfin, don't stop it or twitch it, pull it under, just keep waking it.
Other topwaters that are great for stripers include:
12" sluggos, I pour them myself, and usually don't catch many but almost always the striper is at least 20 lbs when you catch one on the sluggo
jumpin minnow
saltwater super spook
Livingston lure pro sizzle jr (I have caught a ton of hybrids and stripers on this bait)