I replaced my old K&B 40 with a OS 46ax. That means i went from a 10" prop to a 11" prop. I replaced the tires from 2 1/2" to 3". Now i only have 1 1/4" ground clearance. Is this considered adequate clearance for a trainer. I know i still need to get better at landing and stop bouncing but i keep knicking the prop. 20 years ago when i flew it with the K&B i never hit the prop, not once. I am also wondering if i need more negative incidence in the wing. I don't have an incidence meter yet. When i do a good smooth landing the plane seems almost level. It is not nose high. When i slow it down to what looks like a good flare it seems to stall and hit the runway hard, bounce and knick the prop.

What do you guys think?