Keep as is I reckon. I do shoot single myself, but the rules as they are keep the results in balance.
Some people would be tempted to go all double and it would upset the Karma...
Funny really, but I find I'm crapperer using both....., I only realised that my eyes are suffering with my high blood pressure this last month or so. I have to have it at full arms length to see the bloody thing properly
Russ
Air Arms S400 Classic - Hawke Airmax 3-9x40 AO MAP6, SMK QB78 DL - JSR 4x40 Mildot ill.El Gamo ASI sniper, BSA Airsporter MkVI. UBC#22 - Sheridan EB22, Gamo Compact:R77-4:Falcon, Walther PPK, CP88 shiney, SMK G10, Baikal 53M:MAK, Crosman 357