[Fyron]

Well, P&N and Adamant use small numbers for Standard Movement (3-7 or so), whereas Proportions uses big numbers. Engines per move for a ship size is equal to tonnage structure / 50 (which you have in Proportions). If you double (or triple) both of these sets of numbers, you can get slightly more precise movement scales for ship sizes, but you hit the 255 cap on max standard movement points much more quickly. Basically, it boils down to whether you want to require a handful of engines to go "fast" or if you want to require a lot of engines to go "fast".