I’ve had a few punctures in lithions when they were on the rear but not on the front, good tyres tho – they are the same rubber compound as the GP4000s but with a less posh carcass
I have a gatorskin on the back and no bother with grip really but they do feel like the compound is a bit too hard when used on the front – a gatorskin lasts me about 3000 miles on the back, fronts a lot more so I splash out on the front tyres
another option is vittoria rubino pro, they are supposed to be ace, you could get one of those for the front and something a bit more robust for the back