1 metre or 75 cm

Good afternoon
Just wondering I got 75 cm dish and find it very difficult to find arc
What’s will be the difference if I change the dish to 1 meter apart from getting the weak sats and tps
Is it easy find arc on 1 m rather on 75 cm
On tm 2600 it say recommended dish size 1.2 m
Just measured and I can squeeze in 1 m dish
OR
There is no difference in finding arc on 75 or 100cm
Thank you