Use normal tracking force & 45 RPM dance singles instead.
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Probably not a good idea, but probably harmless if you use 2.05 or 2.1g instead of 2.0. Absolutely not a good idea to use 2.5g, IMO. You want to break it in, set the tracking force as recommended and play records designed for cartridge break-in, e.g., the records marketed by Cardas and others. They really do work, but it does take time.
The Cardas record has cartridge break in tracks designed to excercise a new suspension in both lateral and vertical modes. It's made with locked grooves and a harder than normal vinyl, to withstand extended plays in the same groove. I would use that at the manufacturer's recommended maximum VTF before I'd go 25% above the maximum. One hour on the Cardas tracks is worth several hours of music.
OTOH, I wouldn't bother if the cartridge sounded okay for listening OOTB. I'd just play music and enjoy (and learn from) the changes. Cartridges vary all over the lot in terms of how they sound when new and how quickly or slowly they break in. Hearing them change can be interesting, in a geeky sort of way. ;-)
Not a good idea. You could permanently deform the suspension parts which are designed to keep the generating elements within a particular operating position. Unless you went way overboard, the cantilever should hold up, but still, there is no good reason to overstress that as well.
You need to consider that measurements are not all that accurate so you could end up WAY over. I watched the distributor of Allaerte cartridges install a $13,000 cartridge in a friend's rig. He used three different digital scales, all three read differently, with a range of something like .3 grams difference. He averaged the three.
I don't understand the crazy obcession with break in. It will happen in time, and it is not like the music cannot be enjoyed while it is happening. The big changes will happen pretty early, like in the first 20 hours or so.