It all depends
I have a 110, 135, and a 155 for my h34. In low winds, under 12 mph, the 155 with the full main is perfect. If it is 13-16, you can use the 155 with either a reefed main, or the 155 alone. Of course, when racing, the 110 and the main, either full or reefed dending on wind, will give you better balance and pointing. Over 16 mph, you will want th 110 and to reef the main. So, no, keep your 155 and use it when appropriate. It is all a matter of sail balance. Of course, if you have a spinnaker, in light winds that will be your down wind sail. Here in southern Florida, the winds are generally much lighter in the summer. I predominently use the 110 during the winter, and the 155 during the summer months. I would assume in late summer, you generally get lighter winds, making a similar strategy appropriate, with the winds picking up again in September and October. (If you are really serious about winning, I have a 155 kevlar and a 135 laminate mylar sail that allow the boat to point fabulously to wind that I don't use. Email me off list and we'll talk.)
