I feel your memory is just fuzzy from your days when you had mad skills for G-Bike. G-Bike is always an RNG crapshoot on whether you're going to get easy fodder or be dealing with Red Bikes all the time. I usually had to replay it a few times to get a high score.

Speed Square is a different story cause they did alter it a bit when they ported the game from PS1 to PC, and all future ports of VII are based on the PC version. The big difference is that the cross-hairs do move much faster, they have a bigger response to slight touch than the original which makes aiming more difficult. The PC version also has the roller coaster going much faster, you clear the challenge around 40 seconds faster than the PAL version, and it's still faster than the NA console version as well. So you have far less room for error. One the brightside, the Zeppelin Propeller can actually be hit and is worth over 4000 points. So taking out that and the Flying Saucer at the end pretty much guarantees the Umbrella and Flayer.