I'm not going to check your numbers as you've clearly put some work in there, so happy to take it all at face value.
What do you think UK immigration policy should be? Give us some figures.
1. Students
Students shouldn't be counted in immigration figures because they are a largely closed, temporary, eco-system for which the students or their parents are investing large amounts of money, and for which our universities depend. The Tory attack on foreign students has left universities strugging, some facing potential bankruptcy, because nationalised students do not bring in enough money for them to operate on an internationally competitive level. Currently we have some of the best universities in the world, and a British degree no matter which university it is from, carries weight internationally. Its highly desirable to study here and our immigration policy is damaging it.
Its important to consider that research follows academics - universities being the largest part. Competitiveness also exists on an international rather than national stage. It is such a huge part of why powerful countries are powerful. Look at them all, they all have highly prestigious university systems of international acclaim that attract international student bodies who pay massive amounts of money for the privilege to study here. A portion of those students then obtain employment here and become an asset to our country. There is no negative to them, so any attack on them is born out of racism.
2. Work Visas
This is complicated because you have two groups of people. The flexible in-demand list, and then those who are hired by industry which requires a higher level degree (postgrad). This is largely a supply and demand relationship and the main amount of work that needs to be done is to tackle exploitation of foreign labour. If that is tackled then the rest is simply supply and demand. I think any work visa should be attached to a mandatory like-for-like salary - which is supposed to be the case but there are loopholes for exploitation.
So, I'd separate them into two groups, the non-in-demand list should be lowered on its entry requirements to a 2-1 or 1st level degree rather than postgraduate because that was added for reasons that aren't particularly great. The in-demand list should be made much stricter to both fight exploitation and a driving down of wages in the argi and care sectors. THAT latter one is a problem.
3. Couples/Family Visas
Needs a complete revision because its discriminatory. It should be based on a relationship being demonstrably real and nothing more. Such a small number that its neither here nor there though.
4. Aslylum
Reintroduce safe routes so that people can arrive without using the small boats, and then process applications based on genuine need. This includes whether the asylum seeker has existing connections here or are the best English speaking country for them to travel to if that is their first or second language.
People get way too hung up on numbers and less where there are actual failings. E.g. exploitation and damaging of labour markets which are less related to numbers but more about how industry is using foreign labour in low income fields.