It's a fair way inland then Jon.
Was looking at the pictures you posted up mate.......looks like you have some pretty heavy duty line on the reel.....at a guess 20lb breaking strain??
Casting light weights with an under filled spool and heavy line wont make life easy........ you might be better replacing that 20lb? with 10lb line......with a 5ft..... 6lb leader?
The reel spool is quite a big one.........have you thought about some line backing to take up the bulk?.....you could wrap some cheap electrical tape around the spool to build it up........and then add your line.
You only need 150 yds of 10lb line attached to the backing for what you are doing......fill the spool to about 5mm below the spool lip.
You will cast easier and further if you do it.......and present the bait better.
The 6lb? leader will give before you're mainline in the event of a snag you can't get free of.
Having the lighter line......you could also try some small lures.....like Meps.
Not knocking what you have....nor what you are doing....just trying to help mate