I don't miss out on the chance to get what is a fairly good return for my money.
CHF/PLN 1 to 3.3 is a good rate, your speculation will be down to two things;
1. What happens in Greece over the next few months.
2. What PO decides to do, after they win the next election.
Interest rates will go up in PL this year 1 maybe 2 times more, by a further 0.25-0.50%
You should remember, you are already speculating on the currency by earning in CHF, all your overheads are in PLN, so why gamble twice. If you converted your current CHF at 3.35 ( very good rate) you could drop it in a Lokata and get maybe 5-7% on a term deposit. Then you can gamble with your savings over the next few months, deciding when to exchange CHF/PLN again and that will give you a cost average, your currency risk will be minimized.
CHF is a safe haven currency now for the Germans and Austrians, but if the **** hits the fan again, USD will be the currency of choice as always.