Hi @xplosive - we are also trying some booster right now and i would suggest if you start with a new booster, start with a small amount like 0.100 SBD so it's not that hard if it doesn't work as expected ;)
You can try @upgoater or @minnowbooster - these are working fine with spending just 0.075 or 0.100 SBD. You won't get enormous sums, but constant more than you sent :)

Greetings
@twolittlebirds