To add on, 5/3/3/2 feels really right, because the betting rounds feel extremely similar to hold em. The level of information currently available, the opportunity for hands to improve, etc. is really similar to preflop, flop, turn, and river (in fact, we started calling each round flop, turn, and river cause it makes so much sense).
The only downside is that the 2/3 rule means going for a flush or straight in the back is rarely worth it. Pair/pair/pair is what you usually go for. We tried balancing this out by guarenteeing the player with a non-fouled flush or better in the back 1/3 of th