PA28 taught approach at 65 to end of runway
I can't think of any PA28 variant for which that is the correct way to fly it.
Working in knots, every variant I've ever flown you start faster, but with the exception of the Arrow, all of them you want to be either slightly or considerably slower than 65kn over the hedge and onto the runway.
If it's a training aeroplane, then it's most likely a PA28-161 I'm guessing. That would be around 70 initially, slowing to 63 at MTOW, but a typical training weight of 2POB and half tanks would be around 2100lb, maybe 1920lb solo and you need to scale with weight. That gives a speed over the hedge of 60kn 2-up, 58 solo.
The reason you're bouncing is probably that you are approaching 5-7 knots too fast. Incidentally, the maths says that also increases the incremental g due to vertical gusts by about 8-10%. That may not sound very much, but can make a significant difference when trying to concentrate upon getting an approach right.
Out of interest, is the stall warner going off in the flare? If it's not, that's a fairly reliable clue that you flew an approach too fast in a PA28.
G