Noticed by reading your profile, that you havea
B7610. So do I, and I also live on VERY hilly terrrain. And yes, sometimes it does get tippy, esp. with something is the bucket. And really so when I dig out a large rock and it isn't centered on the bucket. (I try to get the heavy object on the unhill side of the bucket if I can if I have to traverse the hill)
The 5' BB helps a lot when I know I'll be doing heavy work.
RonR is correct. Always keep your right hand on that loader lever. (Keep the bucket as low as possible with heavy loads anyway) You can really feel when one of the rear tires is coming off the ground. A quick drop of the bucket (TO THE GROUND, not just down -- that will make the problem worst) will ground you.
Also, I beleive, going back to my 4X4 truck with lift kits and tires and the law ---- That some tractors are just more tippy than others, due to their width and wheelbase. The 7510/7610 is a pretty narrow, short and stubby tractor. It's width (as per Kubota specs) is 46.3", compared to the
B7800's 53.8". (that's 7.5" wider) And it's wheelbase of 59.1" is 6.5" shorter than the 7800's. (65.6") Just like a Jeep Wrangler is more tippy than an extracab Toyota Tacoma. It's wider with a longer wheelbase. And why (according to the law here is Mass.) I can legally lift my Tacoma higher than a Wrangler. It's 5" wider and almost 35" longer. They use a formula Maximum Lift = (Wheelbase x Track)/2200 .
When you add the fact that the tractor does not have the suspension of a truck, and you are carrying a great deal of weight (relative to the tractor) way out front (and possibly high in the air), it's no wonder why they are tippy. As TexasJohn said earlier, after a while you get a feeling of what you can do and what you can't.
-cheers