Nope the clean stall speed for a PA38 is something like 47 knots clean from memory. If you were going for a standard 1.3Vs approach speed makes it 61knts which is why I use that speed and 55knts for short field.
The reason why your having ballooning issues is because you have way to much energy in the flare to get rid of.
The real guide is the POH read the one for your aircraft and have the discussion with the instructor why your not using those speeds.
I know already they will tell you to continue to use 70knts just be aware its bad practise.