You could try the Duncan. If that is not the sound you're after, I would go for a Crawler or an Abraxas on the bridge. They split fine, so you have that F-quack on the fourth position. You're strat with 'percussive' timbers (ash/maple) needs imo a warmer, thicker pickup. The Crawler is the dogs bollocks in a strat. Huge, fat tones, enough topend left to shine, growling like a bear when pushed, excellent splits. HSS-balance is - in my case with Irish Tours - quite good. The volumegap is not that big.