This would be if your top boost channel is already cooking. I'm using a Timmy but have tried an 808 modded TS 9 (too raspy) and a fuzzface (too unreal), Rangemaster (too tinny but works great in the normal channel). What are you guys using to kick it into high gear?
I'll keep an eye out and for a Hot Cake which a lot of people rave about in the top boost channel It is a tricky channel if you are like me and don't use any cut. I really want that smooth type of sound and no ice picks
Have you tried a nice compressor? I always got the best Top Boost lead sounds by running a comp into the amp, set for a volume boost and comp to taste. It's the same sound, with more sustain and doesn't thin out like an overdrive can.
I've just recently been using the Prescription Overdriver. It's a killer boost with the drive set low and when you start to jack that up it turns in to a Velcro type of fuzz. It's also got treble and bass controls which have a nice wide range.
The Hotcake does a fine job at this too. Similar to the RX Overdriver in that it can have a great boost but it also can be a great overdrive. You have to be careful with it because it may not sound how you think overdrives should sound (TS) but it does sound like an extension of your amp.
I also use a Keeley modded Blues Driver that does really well with the Top Boost channel. You have to disabuse yourself how you use a tone knob because you will have to keep it around the 8-10 range.
I have an EHX Nano Boost and an HBE Germania. I like them both. The Nano is a great ballsy clean boost with a touch of gain at high settings and the Germania is a cool "Rangemaster/Fuzz/Treble Booster" type of boost.