Best Practice for thinning Oracle Forms

We are considering upgrading from 10g (10.1.2.3) to (probably) 11g forms initially whist long term migrating to ADF.
Our system is 15 years old and has many issues that go along with a system this old i.e. database keys/indexes missing, forms with lots of code etc.
We have very few resources so thought the best way to go about this would be to thin out all our Oracle forms in 10g prior to upgrade (as this is mainly just a recompile in 11g) but was looking at if there were any best practices as to what level this should be done.
For example we heavily use PLLs. Should the majority of this code be moved into packages or are PLLs ok to use. I take it the majority of program units should be moved to db.
How thin should we aim to make the form. i.e if we are using post queries for something as simple as select customername into :nondbitem from customer where customerid =:customerid. Should we be making this a function in the db and reusing the code in the necessary places?
Just wondering what people would deam best practice before we start.
Thanks

Thanks for all your input.
Although the current database design is not correct we are going to correct the existng database rather than rewriting it.
So were hoping to correct this also!
But what im doing now to get rid some of this post queries for nondbnames is im creating a view of all information i need to display on one pertaining record.
Then i used this view like block basic procedure like relationship to the transactional block.So if you make queries or insert (need to run query the block view) it will give all the necessary record display"
{CODE}
This sounds sensible but we havs hundreds of tables with lots of columns. How are you managing the views/deciding how manytables/columns to include on the forms?

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