Topband: Advice please? SGC-230 on 160m

[G4PUQ at aol.com]

I recently picked up a SGC 230 smart tuner and have installed it at the base 
of my inverted L. The 230 has proven to be just as versatile as all the 
comments I read had  indicated it would be. I am really do want to push up my 160m 
tally later in the year but I also want to (need to) retain the one wire 
antenna to work on 30m/17m/12m 

The only band which I have difficulty tuning is 160m, observing the SWR/Fwd 
meter on my Corsair II suggests that the tuner is constantly hunting looking 
for a good match. 

I plan to upgrade my inv L in terms of vertical height and ground/radials 
during the summer months and would welcome any feedback, suggestions, ideas, 
balun arrangements, radial attachments or experiences using the 230,

thanks and 73, cu on warc bands or 160 

de Peter G4PUQ