forcing use of more indexes (bitmap AND)

query is something like this

    Select *
    from v_test
    where acode Like 'PC%'
    and rev = '0Q'
    and hcm = '1'
    and mcm = 'K'

where acode, rev, hcm, mcm are all indexes.

Currently this query is only using the rev and mcm for the bitmapAND.
it then does a bitmap heap scan using the acode and the hcm indexes.

I would like to try to see if forcing the planner to favour heavier usage of the indexes would yield faster results.

I've tried lowering random_page_cost(default 4) down to 2 with no change in planner.