My mate had this issue, he had to wrap with tape and he made a sort of shade for his lamp to extend it out past the scope, it worked great but didn't look that nice
Get plenty of feeders up in the half where you want to shoot them, or get up in a high seat
if you can weld you can make highseats for about £25-30 worth of steel
ive got one of the callers and it works great, ive always had good luck putting 2 crow deek over a split open rabbit or pigeon and one a bender and using it, always seems to pull them well and help build a pattern up